Imperial National Wildlife Refuge protects wildlife habitat along 30 miles of the lower Colorado River in Arizona and California, including the last unchannelized section before the river enters Mexico.

The river and its associated backwater lakes and wetlands are a green oasis, contrasting with the surrounding desert mountains. Imperial National Wildlife Refuge protects wildlife habitat along 30 miles of the lower Colorado River in Arizona and California, including the last unchannelized section before the river enters Mexico.

The river and its associated backwater lakes and wetlands are a green oasis, contrasting with the surrounding desert mountains.