The Al-Ahsa region with its largest city Al Hofuf is located between Riyadh and Dammam. The region is favoured on account of its strategic position on the trade route between Riyadh and the neighbouring states of Qatar, Bahrain and the United Arab Emirates. The main driving factor for the city is its direct proximity to the world’s largest conventional oilfield. In line with the urban planning system, the city will develop to the east. In this area the Ministry of Housing manages a site that is roughly 200m m2 large and suitable for urban expansion. This land forms the eastern periphery of the Hoful region. The aim of the Dahiyat Al Asfar master plan is the development of a vision and a blueprint for a pioneering, sustainable and urban development in Saudi Arabia. The project and the immediate neighbourhood are characterized by a large number of striking regional features. First and foremost is the Al-Asfar Lake that is fed mainly by surplus irrigation from the date farms and has evolved into an efficient ecosystem that is home to a large number of fauna and flora. Also characteristic of the region and important for it functionally is the world’s largest date palm oasis west of the project area. At the center of the open-space concept is a green network with a central park axis that connects the project area with the city Hofuf and the lake. This axis not only has a recreational purpose and provides car-free mobility but is also the key element of the integrated rainwater man­age­ment concept and serves the retention and diversion of rainwater into the Al-Asfar Lake.