Lake Büyükçekmece( Turkish :Büyükçekmece Gölü) is a liman formed at the point where the river Karasudere flows into the Marmara Sea . The lake is located south of the Çatalca district, west of Istanbul , Turkey . It is used as a freshwater reservoir.
The lake's bar was reinforced in 1988 by a dam . The area of the lake is 28.47km2(10.99sqmi), and is 7km (4.3mi) long and 2km (1.2mi) wide. The maximum depth is 8.6m (28ft), following deepening carried out by the State Hydraulic Works .
The fluvial lake developed as the flow of Karasudere, and as it came downwards from Çatalca it was blocked off and formed by the resulting sandbank it created. A reedy, brackish salt-water lake exists between the Büyükçekmece Dam and the Marmara Sea . Another lagoon, Lake Küçükçekmece , is located around 12km (7.5mi) east of Lake Büyükçekmece.
The number of fish species observed in the lake has decreased from 30 in the past to 15 currently.
A historic 635m (2,083ft) long and 7.17m (23.5ft) wide multiple arch bridge , named after the Ottoman architect Mimar Sinan (1489-1588), spans the narrow opening at the bar connecting the lake to the sea.
At the northern shore of the lake, Istanbul Hezarfen Airfield is situated on a peninsula.
The color of the area between Büyükçekmece Lake and the sea has changed due to pollution. Lots of dead fish washed ashore.
The color of the part of Istanbul Büyükçekmece Lake on the side of Kanuni Sultan Süleyman Bridge has changed. Fish deaths also occurred in the lake, which emitted an intense foul odor to its surroundings.