It is the oldest dam lake in Central Europe; in 1492 the citizens of Tábor dammed the River Tismenický to provide a sufficient supply of drinking water for the town. The lake occupies an area of 50 hectares and reaches a depth of 14 metres.
Originally the local people wanted to breed fish here, but soon the lake proved to be too large for this. And thus the Jordan has not been emptied out since 1830. Nowadays, the Jordán does not only supply the town with water, but it is widely used for recreation. On hot summer days the cool water tempts both the local people and tourists into having a swim.
On the other side of the dam there is an eighteen-metre high waterfall that is created by the stream flowing from the Jordan during high water.