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The most spectacular sea caves in the national lakeshore form in cliffs composed of the Devils Island Sandstone formation.
Sunset through the Keyhole
The Keyhole arch is one of the most well known features at the mainland sea caves.
The “Garage” is the largest sea cave found in the park’s mainland unit.
Mainland Sea Caves from the water
The best way to view the sea caves is being on the water. The opening in the center of the photo contains the “Keyhole” arch.
Balancing Rock is the largest sea stack along the northeast shore of Stockton Island.
Devils Island Sea Caves
The north end of Devils Island is honeycombed with sea caves. Devils Island is the namesake of the colorful, thinly-bedded sandstone formation that contains the most spectacular sea caves.
Looking out towards Eagle Island
Kayakers regularly explore the mainland sea caves from a launch point at Meyers Beach when conditions are calm. Always take caution and check the lake conditions before you head out.
View of the Sea Caves from the Mainland Trail
Several nice views of the mainland sea caves can be seen from overlooks along the Lakeshore Trail.
Looking down from above the keyhole
One of the overlook points along the Lakeshore Trail is located on the promontory that contains the Keyhole arch.
Last updated: August 1, 2014