What is the difference between a lake and tarn?

A lake is a body of water surrounded by land, while a tarn is a small lake that is typically found in a mountainous area. Tarns are often formed by glacial erosion, and they are often found at high altitudes. They are typically very deep, and they may have steep, rocky shores. Tarns are typically fed by snowmelt and rain, and they can be either fresh or saltwater. Some tarns are popular tourist destinations, while others are more remote and difficult to reach.