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Thunder Hole

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description Thunder Hole Overview

Thunder Hole is a natural coastal inlet on Mount Desert Island within Acadia National Park in Maine. Under suitable tide and wave conditions, incoming water enters a narrow rock channel and compresses air inside, producing a resonant booming sound and bursts of spray. A viewing area beside Park Loop Road allows visitors to observe the formation, although the intensity varies substantially with weather and sea conditions.

help Thunder Hole FAQ

Where is Thunder Hole located?

Thunder Hole is a natural coastal inlet located within Acadia National Park on Mount Desert Island in Maine. It is one of the most popular tourist attractions along the park's Park Loop Road.

What causes the booming sound at Thunder Hole?

As incoming waves crash into the narrow, deep rock channel, they force air into a small underwater cavern. The trapped air compresses and violently escapes, producing a loud, thunder-like booming sound and bursts of spray.

When is the best time of day to experience Thunder Hole?

The most dramatic booming sounds and highest spray generally occur just before high tide or during rough seas. Timing a visit to these specific tidal conditions ensures visitors experience the full acoustic effect of the inlet.

Is there a safe viewing area at Thunder Hole?

Yes, the National Park Service maintains a specific viewing platform and guardrails for visitors to safely observe the geological feature. Visitors are strongly advised to stay behind the railings, as rogue waves have occasionally swept people off the nearby rocks.

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