Jim Brandenburg / Glacier flowing between the Chigmit Mountains showing glacial valley, medial and lateral moraines, Lake Clark National Park and Preserve, Alaska

Matthias Breiter / Tidal flats in Turnagain Arm at sunset, Alaska Range, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Sockeye Salmon (Oncorhynchus nerka) school spawning, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Hickerson Lake, a glacial lake in Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Tundra with ponds and the Alaska Range, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Mount Iliamna Volcano, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Tundra landscape, Lake Clark National Park and Preserve, Alaska Range, Alaska

Jim Brandenburg / Lake Clark National Park, Aleutian Range, Alaska

Jim Brandenburg / Tusk Mountain and glacial rivers, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Mount Iliamna Volcano, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Hiker drinking from glacial stream, Lake Clark National Park and Preserve, Alaska

Jim Brandenburg / Aerial view of Lake Clark National Park and Preserve showing glacial valley, glacial lakes and boreal forest, Alaska