Erosion has carved openings in the top and side of a lava shelf at Spouting Horn Beach, where waves now crash through and force water and air up to create a cool blowhole with sound effects. It's part geyser (just not caused by heat and steam as real geysers are) and part blowhorn since somehow air alone is pushed through one of the holes.
There are multiple legends to explain the resulting eerie roar: a dragon god mourning the loss of his sisters fell into the lava tube when tears blurred his vision and he continues to cry for them; a trapped lizard goddess who chased a fisherman into the cave and became stuck continues to moan and growl in anger.
Another blowhole actually used to sit nearby and spray water up to 200 feet high, but that one was dynamited in the 1920's because the salt water spray was ruining the area's sugar cane crops.
The rocky shoreline is very slippery and the large waves are powerful, so enjoy the sights and sounds but don't try to inspect the blowhole phenomenon too closely. When the waters are calm, there is a small swimming beach just west of the hole, but that sand virtually disappears when the surf kicks up.
Mostly diving, snorkeling, and tour groups enjoy the area from offshore and there is free parking available in a paved lot that includes arts and crafts vendors and restrooms. Go early if you can, since lots of visitors and tour busses drop in later in the day.
Take Poipu Rd. towards the water then take the right fork in the road where it curves onto Lawai Beach Rd. Signs will mark the beach parking lot a couple miles up on your left.
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