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Craters of the Moon National Monument
TripAdvisor Traveler Rating: 4 of 5 stars
TripAdvisor Popularity Index: #1 of 1 attractions in Arco

This black jagged landscape, formed between 2,000 and 15,000 years ago, represents the largest lava flow in the contiguous 48 states.

Attraction type: Educational site; Geological formation; Monument; Park; Scenic/historic walking area; National park
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