 The westernmost Lake Walyarta is a claypan that extends eastwards about 30 km from the inland side of the Great Northern Highway.Although its width may reach 5 km, the depth of water never exceeds 2 m. The eastern lake is separated from Walyarta by a calcrete ridge.It is a broad and braided drainage line containing islands of vegetation that floods extensively but soon dries out to a series of isolated salt and claypans.