The Halona Blowhole, located on Oahu’s southeastern coast near Halona Point, is a natural geological formation where ocean water shoots through a lava tube, creating a spectacular spout of water. This natural phenomenon is especially impressive during high surf conditions when the blowhole can shoot water up to 30 feet into the air. The blowhole is part of a scenic coastal area with rugged cliffs and panoramic ocean views. It’s a popular stop for visitors looking to experience the power of Hawaii’s coastal geology and enjoy the dramatic scenery.