On the southern shore of the lake is the South Tufa Reserve. A long nature trail leads down to the water's edge. This area seems to have the highest number of tufa formations, both in and out of the lake (present water level is much lower than it used to be). Tufa (too-fah) are formed when fresh water springs containing calcium bubble up through the carbonate-rich lake water. The combination of minerals forms calcium carbonate, a limestone deposit that is the basis of the tufa formations. Tufa is found in many alkaline lakes of the world.