Koh Sdech is located in Kirisakor district, about 81 kilometers south of Koh Kong provincial town. It attracts visitors from Sihaoukvill and Sre Ambil district.
Koh Sdech features a long beach, and the sea is filled with a variety of fish. The site is excellent for snorkeling or scuba diving, as the water is clear, and an array of coral can be seen growing at the bottom of the sea.
According to legend, there once was a king who commanded an army on the island. Because there was no fresh water, the king searched everywhere to find some. At last he found a rock near the sea. Thinking the rock might contain water; the king drew his sword and split open the rock, releasing an endless flow of water that local people still use today.