Kiama a small town in the southern part of Sydney near Wollongong. This coastal town is at 120 kms south of Sydney in the Illawara district. This 13.9 Sqkm piece of land have one of the main tourist attraction called "Kiama Blowhole". This blowhole is the largest in the world which was formed by Basalt lava around 260 million years ago. This was first sighted by George Bass in the year 1797.How this formed?
There was a volcanic rock called Latite. During a volcanic eruption, it cuts the rock Latite as it contains some softer rock called Basalt. Over some years, this Basalt eroded faster than Latite and forms a small tunnel under the rock Latite with a mouth opening at the top. When Sea water flows into that tunnel with heavy pressure, it shoots out through the mouth of the rock which forms "Blowhole".It can spray 50 liters of water upto 25 meters in the air.
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