The Becharof National Wildlife Refuge covers an area of . It lies on a mountainous coastline containing the Ugashik-Peulik volcano and steep cliffs and the park contains a range of geographical features from mountains, broad valleys and fjords, to tundra and glacially formed lakes. Within the park lies the extensive Becharof Lake which at , long, wide and deep at deepest, it is second largest lake in Alaska and the largest in the entire National Wildlife Refuge System. The lake is fed by a number of rivers and streams, and contains some of the largest salmon populations in the world. The lake has the world's second largest run of sockeye salmon and estimates reveal that Becharof Lake and its tributaries provide the Bristol Bay fishery alone with six million adult salmon per year. Wildlife is abundant in the park and the high levels of salmon are enough to feed the largest concentrations of brown bears in Alaska. Wolf packs, two species of fox, wolverine, river otter, beaver, caribou, seals, sea lions, sea otters and whales as well as various seabirds such as eagles found along the shore.