King Abdullah Economic City ($93bn)
A project aimed at creating a new city in Saudi Arabia close to Rabigh - around 100km north of Jeddah. The project includes a new 14km2 sea port - where initial operations are set to begin in the third quarter of 2013 - a 62.5km2 industrial zone, a 13.5km2 central business district, 48km2 of housing and 27km2 of luxury resorts and housing.
The project is being overseen by Emaar The Economic City - a specially-created economic vehicle set up by Dubai-based Emaar Properties. Much of the building work to date has been carried out by Saudi BinLadin Group.
Major names already attracted to the city include confectioner Mars, Johnson Controls, Pfizer and Sanofi Aventis.
Lusail City ($45bn)
One of the biggest developments in the Middle East. The new Lusail City to the northern side of Qatar will cover a 38km2 site which will eventually house up to 200,000 people. The $45bn project is being developed in several different zones containing residential, commercial and financial districts. It will include a new waterfront, a $275m mall, 22 hotels, two golf courses and four offshore islands. The city will also be home to the Lusail Iconic Stadium - the 80,000-seat showpiece stadium for Qatar's 2022 World Cup and the venue for the tournament's final. The project, which is due to complete in 2020, is being overseen by Qatari Diar - the real estate investment arm of Qatar?s sovereign wealth fund.
Oman Rail network ($30bn)
Part of the wider GCC network which will connect Oman through the UAE and on to Saudi Arabia, Qatar, Bahrain and Kuwait. The project will run from Salalah in the south to Buraimi in the north, passing through the new port at Duq'm on the way. It will be developed in two phases - the first running from Sohar to the capital Muscat (pictured), and the second from Muscat along the coast to Duqm and Salalah.
A tender for a project management contract to oversee the project has just been floated, and government officials have said that they intend to float at least one of the two design & build contracts for the line by the end of the year, with a view to work starting on the project by the end of 2014.
Al Zour refinery and clean fuel project ($30.5bn)
One of the biggest and most important projects identified in Kuwait's 2010-2015 National Development Plan, but like many other projects in the country it had become somewhat mired in politics.
The project for Kuwait National Pipeline Co involves the construction of a fourth refinery at Al Zour at a cost of $14.2bn as well as the construction of a related $16.3bn clean fuel plant.
Contracts for the project had originally been signed in 2008 but cancelled in March 2009 due to political opposition. The work was eventually re-tendered in July last year, with Amec and Foster Wheeler picking up project management contracts to oversee construction in December last year.
When complete in 2018, the refinery will have a capacity to process 615,000 barrels of oil per day. Much of this will be used to help fund a growing demand for electricity.
(Photo for illustrative purposes)
Jazan Economic City ($30bn)
One of the largest of the new economic cities proposed for the Kingdom of Saudi Arabia, but unfortunately also one of its most troublesome.
Although the $16bn refinery is moving along at pace, the development of an economic city around it - including a port, an aluminium smelter and scores of other industries, appears to have almast ground to a halt.
Indeed, the joint venture appointed to develop the city - a partnership between Saudi BinLadin Group and Malaysian contractor MMC - was actually removed from the project in April by the Saudi Arabian General Investment Authority.
Qatar Metro/rail network ($36bn).
Qatar Railways Co announced the award of the bulk of the first phase of contracts for the Doha Metro (pictured) recently, handing out deals worth a combined $8.2bn for the construction of the main Red Line, the Green Line and its two major stations ? Msheireb and Education City.
This was on top of an estimated $400m worth of deals which have been handed out for design and consultancy roles but do not include other expected deals for the construction of phase one of the golden line, rolling stock, and operations and maintenance deals. The first phase of the Metro is likely to complete in 2019.
Meanwhile, a tender for the design of the heavy rail network, which will be carried out in three phases, is currently under consideration. It will eventually connect to Bahrain and to Saudi Arabia as part of the plan to construct a GCC-wide rail network. In February, Qatar Rail CEO Saad Al Muhannadi told the Middle East Rail conference that 26 different consultants had bid for the work.
Makkah Grand Mosque redevelopment ($24.4bn)
A project which is reportedly costing $26.6bn that will see the considerable expansion of the main pilgrimage site for Muslims worldwide.
The work, which is expected to be completed in just two years, will cover the redevelopment of 400,000m2 on the north west and north east of the mosque as well as new stations for the arrival of passengers from the Haramain High Speed railway.
The main gate will also be expanded, with a view to increasing the mosque's capacity to 2.5m worshippers.
Duqm city, port and refinery ($20bn)
The ambitious plan to turn one of the lesser populated areas of Oman into a new industrial centre are showing some signs of progress. A $1.5bn dry dock - the second-biggest in the Middle East - has already completed and the port began commercial operations earlier this year.
Deals were also agreed last month between the Special Economic Zone set up to develop the area and a pair of operators to use its proposed liquid jetty terminal.
It will support the planned oil refinery also being built at Duqm, while a new logistics hub agreed earlier this year will also contribute to the development of its infrastructure. Other plans for the Special Economic Zone include petrochemicals plants, a refinery, airport, hotels and housing for more than 100,000 people to work in the city. It will eventually be linked to the rest of Oman and the GCC by planned new railway.
Sadara Chemical Corp ($17.3bn)
Sadara is a joint venture between Saudi Aramco and Dow Chemical, is building a huge new Petrochemical Complex at Jubail Industrial City II - the biggest chemicals complex ever to be built in a single phase.
The $19.3bn complex will produce up to three million tonnes once it completes. The main tranche of funding - a $10.3bn loan arranged through a syndicate of banks and the Saudi Public Investment Fund, was arranged with lenders earlier this month and a $2bn sukuk has also been issued. The remaining $7.3bn is expected to be finalised by the third quarter of this year.
Hamad International Airport ($15.5bn)
By rights, this should not be on a list of ongoing projects in June 2013, given that it was initially meant to complete in December 2012. However, even though delays have dogged this project - including an 11th-hour decision to halt its opening just hours before the project was due to be unveiled in April 2013 -this makes the list for two very good reasons.
The first - of course - its its scale. At $15.5bn, it is the largest airports project to be undertaken in the region in recent years, and it had around 40,000 people working on it during peak periods.
The second is its potential. With Qatar Airways slugging it out with its two main competitors Etihad and Emirates to become the pre-eminent hub in the Gulf, the facilities it will offer will be important. David Welch, EMEA President of Bechtel, the consortium leading the construction of the facility, has said the finished product will be "stunning". Here's hoping we don't have to wait too much longer to find out.
Jazan refinery ($16bn)
A huge new refinery capable of producing 400,000 barrels per day on the Kingdom's South West coast - for which eight separate engineering, procurement and construction (EPC) contracts were awarded during the final quarter of last year.
The $16bn project, which is due to complete in 2016, is being built by the Saudi Arabian arms of several international contractors - with the biggest deals going to the UK's Petrofac ($1.4bn), Spain's Tecnicas Reunidas ($1bn), Korea's SK Engineering ($1bn), and Japan's JGC Corp ($1bn).
Mohammed Bin Rashid City
Mega-project announced by - and named after - Dubai's ruler Sheikh Mohammed Bin Rashid Al Maktoum in November.
It is set to contain more than 100 new hotels, a Universal Studios complex, and a public park that is bigger than Hyde Park. Although no price tag or timeline was set for the project, the first two developments within the city have already been announced - the $5.75bn Mohammed Bin Rashid City planned by a joint venture between Meydan and Sobha Group and a golf course-based complex by Emaar Properties known as Dubai Hills. Emaar has just recently formed a joint venture with Meraas Holdings to deliver this scheme.
Satorp petrochemicals complex, Jubail ($14bn)
New refinery which will be capable of breaking down heavy crude to produce diesel, gasoline, LPG, petrochemicals and jet fuel. It will be operated by a joint venture between Saudi Aramco and Total once the facility opens later this year and has been built by a consortium led by Japanese contractor Sumitomo.
Jeddah Metro (est: $8.5bn)
Tenders for the programme management of Jeddah's proposed new metro system have been submitted, with firms reportedly in the running to handle the project including Balfour Beatty-owned Parsons Brinckerhoff and a consortium including CH2M Hill and Atkins.
The project will include three lines ? the main one will be a 67km line with 22 stations connecting Makkah Road with Obhur, while a Blue Line containing 17 stations will run from the new King Abdulaziz International airport to the Old Airport Road. A third Green Line will run for 17km along Palestine Road and will also have a branch line to Jeddah's old airport.
Ras Al Khair Aluminium Complex ($10.8bn)
Huge new complex being developed by the Saudi Arabian Mining Company (Ma'aden) in conjunction with US-based aluminium giant Alcoa. The project includes a bauxite mine, refinery, an aluminium smelter, a rolling mill and a rail link to the nearby Jubail Industrial City.
The $4bn smelter was completed last year by a consortium led by Bechtel, while the mine capable of producing four million tonnes of bauxite per year and the alumina refinery are both set to open next year.
New Doha Port ($7.4bn)
A vital project for Qatar for so many reasons ? not least because without it the delivery of much of the building materials required for its metro, rail, stadiums, roads and other projects simply won?t be able to happen.
It will also free up a large part of central Doha where the existing port operates for redevelopment.
Preparation started for the port in 2007 following the issue of a decree by the country?s Emir and is on schedule to complete by 2016.
It contains three separate elements stretched over a 26km2 site ? the new port, a new naval base and a huge new industrial and logistics zone (Qatar Economic Zone). Construction work started in 2011 when China Harbour Engineering Co began excavation and Quay Wall works.
Contracts for the construction of the Quay Wall, the dredging of an access channel to the Qatar Economic Zone 3 and for the construction of the port?s commercial terminals, infrastructure and buildings, are all expected to be announced during the third quarter of 2013.
Photo shows a new quay wall at the container terminal.
Haramain High Speed Rail ($11.1bn)
Project covering a new 450km high-speed rail line linking Saudi Arabia's holy cities of Makkah and Madinah to Jeddah and to the new King Abdullah Economic City being constructed at Rabigh.
The project is aimed at delivering pilgrims to Saudi Arabia's two holy cities much more quickly and involves the construction of up to 150 bridges. It is set to complete next year.
Knowledge Economic City ($7bn)
Project which describes itself as the "new gateway to Madinah. Knowledge Economic City is a 4.8m m2 zone being developed just 5km away from the prophet's mosque in the holy city on the main axis route connecting to the airport and train station for the new Haramain High-Speed rail link. The project is being built over several phases, with a master plan proposing a large, gated residential community, a knowledge cluster with various shoals colleges and academic institutes, a hospitality and commerce tower, souks complex, museums quarter and an area containing residential apartments.
The first phase invokes the construction of a large gated community closest to the Mosque.
Upper Zakum Development Field, Abu Dhabi ($10bn)
One of several major offshore oil development projects being undertaken by Abu Dhabi's National Oil Company as part of a concerted effort by the Emirate to boost both the efficiency and the capacity of its oil operations by 2017.
The upgrade of the UZ750 field involves $10bn worth of work, which has been split into two packages. The first was awarded to a joint venture between NPCC and French specialist Technip in July last year, while the second was a $3.7bn contract awarded to a joint venture between Petrofac Emirates and Daewoo Shipbuildng & Marine in April this year.
The work is expected to complete in 2016.
(Photo for illustrative purposes)
King Abdullah Financial District, ($7.8bn)
The new commercial heart of Saudi Arabia, which is being overseen by Rayadah Investment Co.
The project is an attempt to build a financial centre in the Middle East to match some of the world's major financial hubs and includes the construction of up to 80 new towers, a station for Riyadh's proposed new metro system, hotels, conference facilities, shops and restaurants.
The towers will include a new home for Saudi Arabia's stock exchange, Tadawul, and a 76-storey base for the Kingdom's Capital Market Authority.
Abu Dhabi Metro/light railway ($7bn)
Bids have just been submitted by several consortia looking to run Abu Dhabi's new combined metro and light railway system, which is being developed to link several key areas of the UAE's capital.
The project, which is estimated to be worth a combined $7bn, will begin with a largely underground stretch running from Mina Port at the north of the city to Zayed Sports City in the south. It will be supplemented by two light rail lines - a 15km line running to Reem Island and a 13km line running from the city's central bus station to Saadiyat island.
King Abdulaziz International Airport, Jeddah ($7.2bn)
Work on the new $4bn terminal building which is the centrepiece of a wider $7.2bn redevelopment of Jeddah's King Abdulaziz Airport is now around halfway complete, with the project set to open next year.
The building, which has been designed to achieve a LEED Silver rating, will measure 1km x 1.3km, will have a capacity to handle up to 32 passengers a year.
The terminal is being built by SaudiBinLadin Group, with Atkins and Arup acting as consultants and Areen Design responsible for the fit-out. The remaining $3.2bn of work includes plans for the world's tallest control tower (135m), a major new transport terminus linking to the Haramain High-Speed rail route and a new 4-lane tunnel for ground service equipment being built underneath the airport's runway.
Civil works on the site are being delivered by Al Mabani General Contractors, while a Saudi Oger/Murray & Roberts joint venture is responsible for delivering the service road tunnel.
Riyadh Metro (Est: $7-8bn)
Plans for the six-line, 85-station metro network planned for Saudi Arabia's capital seem to be moving along at pace. Awards for the design of three of the major stations - Olaya Towers, Downtown Riyadh and King Abdullah Financial District - were announced last month, and the shortlist of consortiums bidding to run the network has been reportedly cut to three, with a decision expected soon.
Among those bidding to build the network are consortiums led by France's Vinci Construction, Canada's Bombardier, Spain's FCC Construction and Austria's Strabag Group.
The six-line network is being built with a view to providing an integrated public transport system to a city whose roads are already incredibly busy, and whose population is projected to grow by 40% by 2030.
Image shows proposed design for the King Abdullah Financial District station by Zaha Hadid Architects.
Jabal Omar Development ($5.3bn)
Project linked to the expansion of Makkah's Grand Mosque which will see more than 2.2 million m2 of land nearby redeveloped and a total of 38 new towers created containing hotels and serviced accommodation for the millions of visitors who flock to the city as pilgrims each year. It is also set to contain the Kingdom?s biggest shopping mall.
A special-purpose vehicle set up to develop the towers has said that the 38 towers are likely to be managed by 28 different companies, and that a total of 13,500 new hotel rooms will be added once work completes by the end of 2017.
It is being developed in five separate phases. Hoteliers already signed up to operate towers include Hilton Hotels, Marriott International, and Starwood Hotels & Resorts, which has just signed a deal to operate three hotels in the development.
Midfield Terminal Complex, Abu Dhabi ($3.3bn)
Terminal building being delivered by a consortium between Arabtec, Consolidated Contractors Co and TAV Construction.
The project involves construction of a huge new terminal between Abu Dhabi International Airport's two main runways - hence the name. Once complete, the building will have a capacity to handle up to 40 million passengers a year. Its ceiling will reach 52m at its highest point and its central space will be large enough to house three football pitches.
Work started on the development in August 2012 after the consortium announced that it had raised the necessary project finance required to build the terminal.