The Gulf of Thailand has many coral reefs, and several diving resorts. Due to the tropical warmth of the water, it is popular with tourists. Some of the most important tourist places in the Gulf of Thailand are the islands of Ko Samui and Ko Pha Ngan in Surat Thani province, Pattaya in Chonburi province, Cha-am in Phetchaburi Province, Hua Hin in Prachuap Khiri Khan Province, Ko Samet in Rayong Province,and Ko Chang in Trat Province