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Idaho National Natural Landmarks

Big Southern Butte - 9/22/2023
The largest and youngest (300,000 years old) of three rhyolitic domes formed over a million years near the center of the Eastern Snake River Plain and one of the largest volcanic domes on earth

Cassia Silent City of Rocks - 9/22/2023
Unique rock formations made from volcanic ash 30 million years ago

Crater Rings - 9/22/2023
One of the few examples of volcanic craters found in the U.S., around 2 million years old, with the larger being about 3000 feet across

Great Rift of Idaho - 5/29/1995
The Great Rift volcanic zone is a line of weakness in the Earth's crust, with some of the best examples of open rift cracks in the world

Hagerman Fauna Sites - 9/15/2005
The discovery of 30 skeletons of Hagerman Horses made this one of the world's most important sites for fossils from before the last Ice Age

Niagara Springs - 9/23/2023
Emitting 250 cubic feet of water per second, this is an impressive waterfall nestled in the cliffs of the Snake River Canyon