Nicknamed 'The Big Blowhole' by locals, the Kiama Blowhole is a popular tourist attraction for on average 600 000 tourists a year. A second smaller blowhole exists minutes south of the coastal town of Kiama but is less regarded by tourists and is more difficult to venture through to.
Jet streams erupt into the air through large holes in the volcanic rock formed around the site. This occurs when the ocean current clashes against the latite rock and the overwhelming pressure pushes the water through holes in the rock, often pushing water streams twenty five metres into the air.
If people stand as close to the blowhole as possible then prepare for the possibility of being drenched as the water streams can push water out like a giant water fountain that spouts greater distances.