Spouting Horn Beach Park is located on Lawa'i Road in Po'ipu in south Kauai. The ocean attraction can be viewed from the top of a small hill with a guard-rail. This is a popular spot for tour buses, so expect to share some space at the rail. Like other blowholes, Spouting Horn is caused by a hole in a lava shelf. The ocean rushes under the shelf and up through the hole with a mighty force that sends water shooting into the air. What makes this blowhole slightly different is the addition of a second hole that only emits wind and creates a great moaning sound.