Koh Kood is the farthest island from the coast of Trat. Its size ranks as the fourth of all Thailand's islands or the second to Koh Chang in Trat. The island covers an area of approximately 105 sq.km or 65,625 rai. It is 25 km in length and 12 km in width. Its natural features include mountains and plains where many streams originate and some become waterfalls.