Salt lake, northeastern South Australia.
With a total area of 3,700 sq mi (9,600 sq km) and a maximum depth of 4 ft (1 m), Lake Eyre is the lowest point in Australia, 50 ft (15 m) below sea level. The lake consists of two sections: Lake Eyre North, 90 mi (144 km) long and 40 mi (65 km) wide, is joined by the narrow Goyder Channel to Lake Eyre South, which is 40 mi (65 km) long and about 15 mi (24 km) wide. Lake Eyre is normally dry, and it fills completely only (on average) twice a century. When filled, the lake takes about two years to dry up again.