There are a number of natural processes that can form lakes.

This is how the lake was formed, according to the legend.

The lakes were formed about two million years ago, but are now dry.

The lake was formed as part of building a Dam.

The lake was formed during the ice age by a glacier.

The lake is formed by a dam constructed in the 1950s.

The lake was formed by glaciers during the last Ice age.

Of special interest is evidence that the lake formed after the warm, wet period was thought to have ended.

The lake is formed by a dam built in 1892, one year after the founding of the university itself.

The present-day cities were created after the lake was formed.