Thunder Hole

A natural phenomenon caused by waves crashing into a narrow inlet, Thunder Hole is a sight worth seeing in Acadia National Park.

The spectacular waves and thunderous sounds of the ocean at Thunder Hole draw many visitors to this dramatic location. The rock formation there is such that, the waves crash against rock and water is forced through a small, rock crevice into a small cave. The sound of thunder is created as rushing water crashes against air trapped in cave. The noise is most pronounced between high tide and low tide or after a storm. The waves there can also be dangerous – especially when storms are near. Please follow posted signs and stay within the designated viewing area.

Thunder Hole got its name because of the loud sound that waves sometimes make when rolling into the little inlet. This happens because, down low, there is an area worn out of the granite, that goes deeper into the side of the cliff than it appears it does from above.

Travelers on Park Loop Road in Acadia National Park have certainly spoken these words many times; traveling past Sand Beach from the north, or past Otter Cliff from the South they are descending on one of Maine’s most awe-inspiring natural wonders: Thunder Hole.

Thunder Hole, Acadia National Park: See 620 reviews, articles, and 292 photos of Thunder Hole, ranked No.8 on TripAdvisor among 33 attractions in Acadia National Park.

#8 in Best Things To Do in Acadia National Park

Thunder Hole is the place in Acadia National Park to experience the thunder of the sea against the rocky shores of Maine!

Thunder Hole symbolizes the power of Acadia National Park. When the right size wave rolls into the naturally formed inlet, a deep thunderous sound emanates. The cause is a small cavern formed low, just beneath the surface of the water.