Lakes and Ponds
A maar is a broad, low-relief volcanic crater that was formed by a phreatomagmatic eruption, which is an explosion caused by groundwater coming into contact with hot lava or magma. The maars of Bering Land Bridge National Preserve are unique in their size and location. Devil Mountain Maar (17,500 years old), North Killeak Maar (>50,000 years old), South Killeak Maar (>40,000 years old) and Whitefish Maar (100,000-200,000 years old) are the four largest maar lakes in the world. They are also at the northernmost point of where maar lakes can be found in the world. Maars usually fill with water to form a shallow crater lake.
NPS Photo - Andrea Willingham