National Natural Landmarks

Great Rift System

Great Rift System
Great Rift System

The Great Rift System represents a tensional fracture in the Earth's crust that may extend to the crust-mantle interface. It also illustrates primary vegetation succession on very young lava flows. The Great Rift System is unique in North America and has few counterparts in the world.

Location: Blaine County, ID ; Minidoka County, ID ; Power County, ID

Year designated: 1968

Acres: 171,999

Ownership: Federal

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