Twin Lakes is an inaccurate name, as only one permanent lake exists.

There are only a few sites in the world where permanent lakes of lava exist.

There is no permanent lake behind the dam.

The artificial and more permanent lakes were created using lessons learned from the subsidence problem.

It has a fairly regular inflow of water and is considered to be a permanent lake.

The normally permanent lake may dry out during severe drought periods, such as occurred at the beginning of the twentieth century and again in 1984-1985.

These can include permanent lakes and areas receiving water for 5-7 months of the year.

For aesthetic and safety reasons, the system can be designed so that there is a permanent lake.

In the larger depressions, permanent lakes or ponds of water remain.

A permanent lake can provide useful recreation facilities such as sailing, windsurfing, or of wildlife.