The bottom of Chott el Djerid is located between 15 and 25 meters (about 50 to 80 feet) above sea level. The lake's width varies widely; at its narrowest point, it is only across, compared to its overall length of . At times, parts of it appear in various shades of white, green and purple. The narrow
eastward inlet of the chott is also known as
Chott el Fejej. It is the largest
salt pan of the
Sahara Desert, with a surface area of over 7,000 km2 (some sources state 5,000 km2). The site has a typical
hot desert climate. Due to the harsh climate with mean annual rainfall of below 100 mm and daytime
temperatures sometimes reaching 50 °C (122 °F) or more during summer with dense
solar radiation, water evaporates from the lake. In summer Chott el Djerid is almost entirely dried up, and numerous
fata morganas occur. It is situated at in the center-west of the country, between the cities of
Tozeur and
Kebili. During
winter, small
tributaries of water can be seen discharging into the lake. Because the
flooded area is very variable, values presented for the area of the lake (or its basin, which is almost always dry), can vary widely. Some sources provide values for surface area as high as 10,000 km². Currently,
freshwater irrigation schemes are being applied in the region to help eliminate salt from soils and increase the productive area. South of Chott el Djerid, the
Grand Erg Oriental desert begins. The towns of
Kebili and
Douz are located south of the lake, and the city of
Tozeur is located just to the northwest. ==Access==