In South-Central Western Australia, in the physiographic division which the writer has termed the Central or Salt Lake Division, in a large portion of which the average annual rainfall is about 10 inches per annum, numerous “dry” lakes or playas occur. These have been described and the question of their origin has been discussed by various authors. They have been differently regarded as due to glacial, marine, and wind action; also as the remains of old Tertiary rivers now largely obliterated by drifting sands; and also (in part) as deformation basins. Most writers agree that they have been formed under subaerial conditions, and probably most will ultimately agree that deformation is responsible for some at least of the lakes, or has aided in their formation.