The foremost reason why Thailand is so popular among tourists is the geographical diversity the country has to offer. Thailand has a cluster of tropical islands, a vast complex of rivers & channels, deep dense forests and lofty mountain ranges. Island in Thailand are both in Gulf of Siam and in the Andaman Island. Several beach destinations like Phuket, Sumoi, Pattaya and Patpong are highly popular among tourists. Chiang Mai and Chian Rai are also renowned places for nature-lovers in Thailand.