In 1980, Congress established the 3.5 million-acre Alaska Maritime National Wildlife Refuge, the world’s largest marine bird and mammal sanctuary. In a continuing effort to assess the seabird colonies on the some 2,500 islands comprising this refuge, the mainland cliffs and islands along the eastern half of the Alaska Peninsula were surveyed in 1980 and 1981. Much of the survey area also lies within the Becharof National Wildlife Refuge and Katmai National Park. Recent offshore oil leasing in Shelikof Strait and lower Cook Inlet requires better documentation of the region’s nesting seabirds.