The name “Thunder Hole” might cause some raised eyebrows, but all Mainers know about this small-but-powerful inlet in Acadia National Park. Located along Ocean Path between Sand Beach and Otter Cliff, this unique formation of rocks causes a huge boom when waves hit it at the right speed.

When waves hit the rocks at Thunder Hole, they may spurt as high as 40 feet in the air, bringing a powerful visual element to the sonic boom that follows.
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This huge noise is created when the high speed waves hit a small cavern at the base of the rocky inlet. The impact reverberates through the cavern, essentially emulating a thunder clap.
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Even if it's a calm day and the thunderous roar of the waves can't be heard, a trip to Thunder Hole results in beautiful ocean views and a stunning sunrise or sunset.
Photography by Deb Snelson / Moment Collection via Getty Images

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A stone walkway has been created so visitors can walk down close to the Thunder Hole inlet. But watch out! Waves can frequently crash over this walkway and the sea can be extremely dangerous in those conditions.
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After a visit to Thunder Hole, consider walking along Ocean Path, a 4.5-mile round-trip trek along the coast that hits some of the area's most beautiful viewpoints.
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Take a moment to inhale while visiting Thunder Hole. Wild rose bushes line the stairway down towards the water and the fragrant scent wafts through the air when there's a light ocean breeze.
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Thunder Hole is a classic stop in Maine’s beautiful Acadia National Park. Just be prepared to get a little wet!

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Thunder Hole, Bar Harbor, ME 04609, USA