Lake Eyre north and Lake Eyre south, both connected by a 15km channel.
Lake Eyre north is part of Australia's most arid region with an evaporation rate of 2.5 – 3.5m per year (8.2 – 11,5 feet) but a mean annual rainfall of 150mm. It lies 15m (50feet) below sea level and is the largest salt pan in the world. The crust is about half a meter thick floating on 6 metres of briny mud. Nothing grows on it but the crystals of salt.