Following is an excerpt about Thai Karsts:
'These limestone karsts were formed 260 million years ago when a shallow sea, running the entire length of south Asia, slowly built up deep deposits of coral and shells which were later buried under sediments deposited from inland.
These remains formed limestone and this was thrust up above the surface when the Indian subcontinent collided with mainland Asia some 30 million years ago. From Gualin in China, to Sarawak in Borneo, the limestone created craggy islands on land and in water. In the South of Thailand, the provinces of Surat Thani, Phang Nga, Krabi and Trang have the most spectacular examples of this type of scenery.
Limestone is extremely porous and so water can easily erode it through rain or wave action, which makes for some spectacular caves (Thai "tham", although sea chambers may be referred to with the same word as a room - a "hong"). When the roofs of islands or other coastal caves collapse, the prized, blissfully private beach and secret garden of an island "doughnut" may be created. Caves are also associated with bats and in Thailand with swiftlets that make the edible birds nests.'There is something truly magical about sailing between these monolitic remains of living creatures from millions of years ago...


