Emerald Cave (Morakot Cave) - The cliff ranging at the west of Koh Mook is the site of Morakot Cave. To admire its beauty is to swim about 70 m through the cave.
Sra Morakot is almost a round pool about 1-2 meters deep and 20-25 meters in diameter. The color of water changes into pale green or emerald upon the reflections of the sunlight.
The water of Sra Morakot comes from the spring-fed pool known as “the Blue Pool”, 600 meters away on the hill. Sulfurous, alkaline water from the Blue Pool wells up and flows through cracks in the rocks to cascade down to Emerald Pool. Consequently, the water is always clear because of the high calcium carbonate that makes all the suspended particles settle to the bottom. In addition, algae cannot grow in the water.
The Phi Phi Islands are located in Thailand, between the large island of Phuket and the western Strait of Malacca coast of the mainland. The islands are administratively part of Krabi province.