Kodiak Island is a rugged Alaskan landscape shaped by ancient glaciers and volcanic ash.

Nature · Published 30 September 2026 Swipe more like this →

In short: Spanning over 3,500 square miles, this massive island in the Gulf of Alaska serves as a sanctuary for thousands of brown bears. Beyond its wild interior, the island holds a complex history of indigenous heritage, Russian colonial fur trading, and dramatic geological shifts that continue to define its unique environment.

Kodiak Island, the largest island in Alaska and the second largest in the United States, is an extension of the Kenai Mountains. Its geography is a study in contrasts: the eastern coast features elevations exceeding 5,000 feet and dense forests, while the southwestern region, which escaped the reach of ancient glaciers, consists primarily of moist tundra. This diverse terrain is heavily influenced by the Kuroshio, a powerful oceanic current that brings warm, humid weather to the region.

The island has been home to the Alutiiq people for approximately 7,500 years. European exploration began in 1763 with Russian fur trader Stephan Glotov, followed by the establishment of the first permanent settlement at Three Saints Bay in 1784 by Grigory Shelekhov. During the 19th century, the island became a critical hub for whaling and the hunting of sea otters. Following the 1867 U.S. purchase of Alaska, the economy shifted toward commercial fishing, ranching, and canning, industries that remain vital today.

Kodiak’s landscape is frequently reshaped by volatile natural forces. In 1912, the eruption of the Novarupta Volcano blanketed the island in 18 inches of ash, which initially devastated local salmon fishing but eventually fostered lush vegetation. Decades later, the 1964 earthquake caused massive seismic shifts, raising parts of the island by 30 feet and triggering destructive tsunamis. Despite these challenges, the island remains a hub of activity, hosting the Kodiak National Wildlife Refuge and the only nonfederal satellite launch facility in the country.

Today, the island supports a rich ecosystem, including red foxes, elk, and roughly 200 bird species. Most notably, the Kodiak National Wildlife Refuge, established in 1941, protects a population of about 3,000 Kodiak brown bears. These animals represent the largest variety of grizzly bear, thriving in a habitat that has survived both industrial accidents, such as the 1989 Exxon Valdez oil spill, and the island's own intense geological volatility.

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