Ukinrek Maars

Ukinrek Maars is a volcanic crater system in Lake and Peninsula Borough, Alaska, consisting of two crater formations of different sizes. The eastern crater measures approximately 300 meters across, while the western crater is smaller and contains a roughly 49-meter-high lava dome that sits within its crater lake.

This crater system formed during an intense volcanic eruption that lasted ten days in March and April 1977. This was the first recorded volcanic activity at this location and represented a major geological event for the region.

The name Ukinrek comes from an indigenous language and means Two Holes, directly describing the two crater formations. Local communities have long used this name to reference the distinctive dual craters in their territory.

This site is located in a remote region of Alaska and is difficult to access, so careful planning is essential before visiting. Visitors should prepare for rugged conditions and limited infrastructure, and seek local guides or expert assistance.

The eruption ejected roughly 26 million cubic meters of tephra and produced around 900,000 cubic meters of lava. These massive volumes of volcanic material created clearly visible layers in the surrounding landscape that reveal the power of this sudden event.

Location: Lake and Peninsula Borough

Elevation above the sea: 91 m

GPS coordinates: 57.83170,-156.51000

Latest update: December 12, 2025 12:06