Spouting Horn is located on the southern coast of Kauai west of Poʻipū. This area of Kauai is known for its crashing waves (nearby Poipu translates to "crashing"). These waves erode lava rocks on the coastline which can create narrow openings, as is the case with Spouting Horn. With every wave, water shoots upward when it is forced through an opening and creates a sound...