It serves as a haulout site for Pacific walrus .
Hall Island is a small island located 3.5 miles ( 5.6 km ) to the northwest of St. Matthew Island in the Bering Sea in Alaska , United States .
Hall Island serves as a haulout site for Pacific walrus .
Hall Island is a small island located 3.5 miles ( 5.6 km ) to the northwest of St. Matthew Island in the Bering Sea in Alaska , United States .