Claim: Ukinrek Maars is a part of the Aleutian Range in Becharof National Wildlife Refuge, Alaska, on the Alaska Peninsula, elevated at 299 ft with its last erupted between March and April in 1977.
Evidence: Aleutian Range Becharof National Wildlife Refuge, Alaska, on Alaska Peninsula 299 ft (91 m) March to April 1977 
The Ukinrek Maars are two phreatomagmatic vents that formed on the north side of the Aleutian Range on a low area bordering the Bering Sea. Becharof National Wildlife Refuge, Alaska, on Alaska Peninsula The eruption occurred in March and April 1977 and lasted for ten days. 299 ft (91 m)