What is the Greater Yellowstone Ecosystem?

The Greater Yellowstone Ecosystem is one of the biggest 'almost completely preserved' ecosystems in the United States.

At maximum extent, the ecosystem is 34,400 square miles in area covering parts of Wyoming, Montana, and Idaho.

Yellowstone lake

The ecosystem has one of the largest populations of grizzly bears outside Alaska.

The ecosystem also has one of the largest elk herds in America.

There are two national parks in the Greater Yellowstone Ecosystem: Yellowstone National Park and Grand Teton National Park.

Grand Teton National Park

Yellowstone National Park is considered the heart of the ecosystem.

The National Park is known for its hydrothermal features, wildlife, hikes, lakes, and scenic views.

The area is home to an estimated 5,000 American bison.

Millions experience this pristine ecosystem annually. Yellowstone and Grand Teton National Parks together hosted nearly 8 million people in 2023.