Thunder Hole

Acadia National Park

Acadia National Park, off the coast of Maine, has been shaped and formed by the power of the sea. Nowhere is the sea’s power on display more than at Thunder Hole, where waves, water and air combine to make one thunderous boom!

Thunder Hole is a naturally formed inlet caused by the repeated erosion of ocean waves. At the end of the inlet is a small cavern. When crashing waves from the ocean travel down the inlet and into the cavern, air and water are forced out.  The result is a loud sound, like claps of thunder and water spouted several feet into the air and a true testament to nature’s power – in fact, water at Thunder Hole has been known to spout as high as 40 feet!  Visitors to Thunder Hole can also take in spectacular views of Otter Cliffs and Sand Beach.

When to Go:

Thunder Hole produces its best sound midway between low and high tide. If you’re brave, the absolute best time to visit is just after a storm has passed out to sea.


N44° 19.2546', W068° 11.334'

Getting There:

From the park entrance station travel south along the Park Loop Road. Thunder Hole is just south of the Sand Beach Road turn off. Parking to get up close to Thunder Hole is along the right side of the road and there is a ramp connecting the parking lot and observation tower.

Road Conditions:

Acadia National Park is open year round. The Park Loop Road is a paved road that provides easy access to Thunder Hole. Be sure to exercise caution when exploring the areas surrounding Thunder Hole given the frequent wet conditions.

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