Deriba contains two lakes, which are known as the Deriba lakes. A deep lake occupies the northeastern area of the caldera, and being located in the lowest part of the caldera floor it is the sink of Deriba. In 1918 it had dimensions of , but by 1964 the size of the lake had increased. The lake is surrounded by a gradually sloping muddy beach with the exception of the northern shore. This lake is also known as the female lake, with green salty water. The salt consists of chloride, potassium and sodium salts.