Phuket is the biggest island in Thailand, located in the Andaman Sea of southern Thailand. The island is mostly mountainous with a mountain range in the west of the island from the north to the south. The mountains of Phuket form the southern end of the Phuket mountain range, which ranges for 440 kilometres (270 mi) from the Kra Isthmus. The highest elevation of the island is Khao Mai Thao Sip Song (Twelve Canes), at 529 metres (1,736 ft) above sea level. It is estimated that Phuket has a total area of approximately 570 square kilometres (220 sq mi) (including the province's other islands). Phuket is approximately 536 miles (863 km) south of Bangkok, and covers an area of approximately 543 square kilometres (210 sq mi) excluding small islets. It is estimated that if all its 39 other small islands are included, Phuket Province will cover an area of approximately 590 square kilometres (230 sq mi). The island total length, from north to south, is estimated at 30 miles (48 km) and 13 miles (21 km) wide. Phuket's topology is exceptional with 70 percent of its area covered with mountains which stretch from north to south and the remaining 30 percent being plains located in the central and eastern parts of the island. It has a total of 9 brooks and creeks but does not have any major rivers. Forest, rubber and palm oil plantations cover 60% of the island. The western coast has several sandy beaches, while on the east coast beaches are more often muddy. Near the southernmost point is Laem Promthep (Brahma's Cape), which is a popular sunset viewing point. In the mountainous north of the island is the Khao Phra Thaeo Non-hunting Area, protecting more than 20 km² of rainforest. The three highest peaks of this reserve are the Khao Prathiu (384 metres (1,260 ft)), Khao Bang Pae 388 metres (1,273 ft) and Khao Phara 422 metres (1,385 ft). The Sirinat National Park on the northwestern coast was established in 1981 and protects an area of 90 square kilometres (35 sq mi) (68 kilometres (42 mi) marine area), including the Nai Yang beach where sea turtles lay their eggs. One of the most popular tourist areas on Phuket is Patong Beach on the central western coast, perhaps owing to the easy access to its wide and long beach. Most of Phuket's nightlife and its cheap shopping is located in Patong, and the area has become increasingly developed. Patong means "the forest filled with banana leaves" in Thai. Other popular beaches are located south of Patong. In a counterclockwise direction these include Karon Beach, Kata Beach, Kata Noi Beach, and around the southern tip of the island, Nai Harn Beach and Rawai. To the north of Patong are Kamala Beach, Surin Beach and Bang Tao Beach. These areas are generally much less developed than Patong, and sought out by individuals, families and other groups with a preference for more relaxed and less crowded environs than Patong. There are many islands to the southeast, including Bon Island, just a short boat trip away. There are several coral islands to the south of Phuket, the Similan Islands lie to the north west, and Phi Phi Islands to the south east. Islanders engage in a lively tourist trade, catering to snorkellers and scuba divers. Ko Phi Phi Don (Thai: เกาะพีพีดอน, pronounced [kɔ̀ʔ pʰīː pʰīː dɔ̄ːn]) is the largest of the Phi Phi Islands, in Thailand. The islands are administratively part of Krabi province. It is the only island in the group with permanent inhabitants. Like the other islands in the group, Ko Phi Phi Don is a non-volcanic island largely made of limestone. It is almost separated into two islands, but a strand of flat land connects them. On this strand lies the largest town on the island, as well as most of the resorts. Khao Lak (Thai: เขาหลัก) is a region of seaside resorts located in the Takua Pa District of Phang Nga Province, Thailand. It is popular for its serene ambiance and as a departure point for liveaboard scuba diving trips to the Similan Islands. Located approximately 60 kilometers north of the island of Phuket along Phetkasem Road, (Thai Route 4), one of four major highways in Thailand, Khao Lak is serviced regularly by buses. Phuket International Airport (HKT) is situated 74 kilometers south on the island of Phuket. Though Thailand's economy is mostly export-dependent, Khao Lak remains mostly tourist-dependent, with surrounding agriculture and commercial fishing making up a small contribution to Thailand's overall economy. Differentiating Khao Lak from neighboring tourist destinations like Phuket are its quiet, up-scale, secluded coastal resorts; uncrowded beaches; family-friendly nighttime environment and provincial ordinances that prohibit structures taller than the height of a coconut palm tree, keeping Khao Lak down to earth.