Island Park Caldera, Volcanic caldera in Idaho and Wyoming, United States.
The Island Park Caldera extends over 80 kilometers in length and 65 kilometers in width, forming a large depression in the landscape.
The caldera emerged from a massive volcanic eruption 2.1 million years ago, releasing 2,500 cubic kilometers of ash across North America.
The Harriman State Park within the caldera preserves the legacy of early Union Pacific Railroad investors who maintained the land from 1902 to 1977.
The area provides opportunities for snowmobiling, fishing, Nordic skiing, and wildlife observation throughout all four seasons of the year.
The Henry's Fork Caldera, nested inside the main caldera, produces the Mesa Falls Tuff and shares its western rim with the larger formation.
Location: Idaho
Location: Wyoming
Elevation above the sea: 2,805 m
GPS coordinates: 44.33000,-111.33000
Latest update: March 12, 2025 20:42
Mystic Falls
40.1 km
Huckleberry Ridge Tuff
0 m
Henry's Fork Caldera
0 m
Mesa Falls Tuff
0 m
Henrys Lake
35.5 km
Upper Mesa Falls
15.8 km
Big Springs
19.9 km
Grizzly & Wolf Discovery Center
40.7 km
Black Sand Basin
40.7 km
Lower Mesa Falls
18 km
Union Falls
39.7 km
Jewel Geyser
41.5 km
Iris Falls
32.3 km
Johnny Sack Cabin
19.9 km
Bechler Falls
32.4 km
Bishop Mountain Lookout
17.8 km
Colonnade Falls
32.1 km
Conant Creek Pegram Truss Railroad Bridge
35.2 km
Independent Order of Odd Fellows Hall
31.1 km
West Yellowstone Oregon Shortline Terminus Historic District
40.8 km
Cliff Geyser
40.6 km
Rankin Motel
30.7 km
Sapphire Pool
41.5 km
Avoca Spring
41.4 km
Jewel Geyser
41.4 km
Union Pacific Dining Lodge
40.8 km
West Yellowstone Public Library
40.9 km
Mesa Falls Scenic Byway
16.2 kmReviews
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