Kigigak Island is an island located near the northwest corner of Nelson Island at the mouth of Ninglick River, 110 miles west of Bethel in the Yukon-Kuskokwim Delta. It is 5 miles across. The island has a land area of 31.839 km² (12.293 sq mi) and was unpopulated at the 2000 census. It is part of the Bethel Census Area. The nearest populated communities are Newtok and Tununak.