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.