• Large male brown bear at Brooks Falls

    Katmai

    National Park & Preserve Alaska

Environmental Factors

Mageik Volcano from the Griggs Visitor Center
Mount Mageik is one of many active volcanoes within Katmai's boundaries. Volcanoes continue to shape the Katmai's landscape, ecology, and history.
NPS/M. Fitz

Geology: Katmai is a volcanic park, an Ice Age park, and a Jurassic park.
Physiography: Katmai is encompasses two distinct physiographical provinces.
Water: Katmai contains hundreds of miles of rivers and streams and hundreds of thousands of acres of lakes.
Weather and Climate: A subarctic climate and variable weather influences every living thing in Katmai .
Wilderness: Most of the park is officially designated as wilderness by the U.S. Congress.

Did You Know?

Cub in water

The average mid-summer weight of Katmai's adult male bears is 600-900 pounds (272-408 kg). Some of those bears will weigh over 1000 pounds (450 kg) in the fall. Amazingly, those bears only weighed 1 pound (.5 kg) when they were born.