One of the largest—and last—remaining wild places in North America, the Crown of the Continent ecosystem is a ten-million acre expanse of land whose untouched wilderness harkens back to the days of Lewis & Clark. View photos taken by conservationist Gene Sentz, co-founder of the Friends of the Rocky Mountain Front, who has spent three decades working to protect the Rocky Mountain Front. Earthjustice has worked with organizations like Gene's to protect the Front, the surrounding landscape and the wildlife that reside there from harmful development.
An outfitter traveling with a pack horses along the Rocky Mountain Front.
Every March, tens of thousands of snow geese rest at Freezeout Lake in Montana after a nearly 1,000 mile flight from California before heading off to Canada.
A view of the Sun River, which Native Americans called the "Medicine River" because they believed the hot springs possessed healing properties.
Sunrise in the Rocky Mountain Front.
Rocky Mountain Peak (top right) is the highest peak in the whole front range south of Glacier National Park.
This black bear sow ran her three cubs up a tree after the photographer came upon them in the wilderness.
(If you look at the top of the picture, you can see the one of the cubs' bottoms.)
A local rancher's horses standing peacefully in front of the mountain, Old Man of the Hills, on a very cold and windy day.
A view of the Sun River with Sawtooth Mountain in the background.
Climbing Mount Werner in Montana.
A view of Two Medicine Lake in Glacier National Park. The highest mountain, in the upper right corner, is called Rising Wolf.
A bundle of moss and wild mushrooms in the Rocky Mountain Front. The pink flower is called Prince's Pine or Pipsissewa by the Blackfeet Indian tribe.
Hiking through Quaking Aspen trees in the fall.
A fly fisherman on Two Medicine Lake in Glacier National Park.
Two Medicine Lake, part of Glacier National Park.
Mount Cleveland, the highest peak in Glacier National Park.
The mountain is named after Grover Cleveland, the only U.S. President to serve two non-consecutive terms.
Cameron Lake in the Waterton-Glacier International Peace Park, located on the borders of Montana and Alberta.
The Belly River Ranger Station in Glacier National Park.
The large mountain in the background is Chief Mountain, one of the most prominent peaks and rock formations along the Front.
Established as the tenth national park in the U.S., Glacier National Park celebrated its 100th anniversary on May 11, 2010.
A view of Lake McDonald, the largest lake in Glacier National Park.
A mountain view sunset over the Rocky Mountain Front.
Grinnell Glacier, which was named by George Bird Grinnell, an American naturalist widely credited as the father of Glacier National Park.
A view of the Rocky Mountain Front, which is part of the Crown of the Continent ecosystem, a 10 million acre expanse of wild lands.
A bighorn ram in Sun River country.
The Rocky Mountain Front is thought to contain the largest herd of bighorn sheep in the lower-48 states.
A glacier lily, an early spring flower widely found in Glacier National Park.
Swift Reservoir Lake in Birch Creek, with the Bob Marshall Wilderness in the background.
The Calypso orchid, also known as the Fairy Slipper or Venus's Slipper, is a perennial member of the orchid family found in undisturbed northern and montane forests.
The photographer, Gene Sentz, climbing Ear Mountain in Montana, with the Bob Marshall Wilderness in the background.
The Sun River, with Castle Mountain in the center background.
Some 3,000 elk come to the Sun River wildlife management area every year.
A frozen paw print, most likely of a lynx, a threatened species found throughout the Crown ecosystem. (Learn more about lynxes.)
Teton River in Teton Canyon in Montana. The yellow trees growing along the river bottom are cottonwood trees.
Members of the Coalition to Protect the Rocky Mountain Front meeting with a member of Sen. Max Baucus' staff (second from left). Sen. Baucus (D-MT) successfully helped pass legislation in 2006 that withdrew all public lands along the Front from oil and gas leasing and hardrock mining.
A frosty morning on the Rocky Mountain Front.
Three rams running through the snow just west of Choteau, Montana. The photographer was snowshoeing and accidentally spooked the rams. (Learn about bighorn sheep.)