Mono Lake is a remnant of a larger ancient lake that was formed by volcanic activity in the Eastern Sierra Nevada.

Mono Lake is a unique saline lake located in the Eastern Sierra Nevada. It was formed in a basin created by volcanic activity millions of years ago. Over time, the lake basin filled with water, and the lack of outlets led to the accumulation of salts, making the lake highly saline.The surrounding volcanic terrain contributes to the lake's unique ecosystem, with volcanic hot springs and mineral deposits adding to its distinctive character.