Coasts / Shorelines

Looking out toward water with mountains, clouds and blue sky in the background
Katmai Bay is a very tidal landscape.

NPS Photo/Lian Law

Separated from the rest of the park by the Aleutian Range, Katmai’s eastern coast is a spectacular wilderness area ranging from narrow fjords guarded by bald eagles to broad coastal flats monopolized by clam-digging bears. The Katmai coastline extends from the mouth of the Kamishak River in Kamishak Bay to Cape Kubugakli in Shelikof Strait. The entire coastline has been shaped by glaciation, with long, narrow fjords and U-shaped valleys.

The 497 miles of the Katmai coast encompass an array of habitats, including salt marshes, sedges, mud flats, gravel beaches, sand beaches, rocky shorelines, alder thickets, and salmon berry bushes. The only stand of Sitka spruce in the park is also located on the coast, emphasizing the variety of coastal habitats. Wildlife thrive in the various habitats and wolves, foxes, puffins, cormorants, and kittiwakes are fairly common.

Katmai’s brown bears are found in the highest densities along the coast where nutrients and resources are consistently abundant. During early summer, bears spend much time foraging on the coastal sedge flats at Cape Chiniak and Swikshak, Hallo, and Kukak Bays. Due to the wide variety of food sources and unconfined terrain, the bears are highly solitary. Once the salmon begin running on the coast, many bears will move to streams and rivers to catch the abundant fish. Pre-winter feeding can result in groups of 5-10 to fish the salmon streams together. However, unlike the Brooks River bears, these brown bears also have access to other coastal food resources and they are known to clam along the coastal tidal flats. They use various eating techniques, including crushing shells or using their jaws and claws to pry open shellfish.

The present-day uninhabited Katmai coast belies the rich cultural history of its past. Ancient travelers left the remains of their campsites along this coast for thousands of years , and were followed by a long series of resident Native cultures, hunters, trappers, traders, travelers, priests, scientists, and fishermen. During the recent 20th century, commercial clam canneries were among some of the human enterprises to leave their mark on the Katmai coast.

While the Katmai coast appears to be untrammeled by development, it is still an area vulnerable to man’s mishaps. In 1989, the Katmai coast was heavily impacted by the Exxon Valdez oil spill. Although the coast was over 250 miles away from the actual spill, the strong Alaska Coastal Current located directly offshore carried the oil to the park within three weeks. Over 1055 tons of oiled debris were removed from the Katmai coast during the first five months.

Geographic Harbor bears
Brown bears at Geographic Harbor in Amalik Bay.

NPS Photo by Peter Hamel

Last updated: October 20, 2021

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