Susan Hoi, or Shell Cemetery, is a unique geological formation dating back 75 million years. It consists of fossilized freshwater shells that accumulated over millions of years to form massive rock slabs extending into the sea. This site is one of only three such locations in the world, with the others in Japan and the USA. The formation offers a rare opportunity to witness Earth's ancient natural history and provides an unusual backdrop for photography enthusiasts exploring Krabi's diverse attractions.