Kamphaeng Phet (, ) is a province in upper central Thailand. It borders the provinces of Sukhothai to the north; Phitsanulok to the northeast; Phichit to the east; Nakhon sawan to the south; and Tak to the west and northwest, covering over and is the fourth-largest provinces in central Thailand. Kamphaeng Phet has the Ping River flow through is main river of the province, making river flats make up much of the east of the province, while the west is mountainous which is part of Dawna Range and it covered with plentifully forest. Kamphaeng Phet known its natural beauty and has a long history, its many important places such as Kamphaeng Phet Historical Park, Khlong Lan National Park, and Mae Wong National Park. Toponymy In Thai or Lao kamphaeng means 'wall' and phet (from Sanskrit vájra) means 'diamond'. The name means 'wall as hard as diamond'. This wall served as a defensive line to protect the Ayutthaya Kingdom from what is now modern-day Burma. The old name was Khao Kampeng, referring to a 'mountain wall' between the two countries. Geography The main river is the Ping, a major tributary of the Chao Phraya River. River flats make up much of the east of the province, while the west is mountainous and covered with forests. The total forest area is or 23.5 percent of provincial area. One of the provinces best-known products is bananas, especially the kluai khai, a small, round, sweet banana. Banana festivals are held every year to thank the spirits for the harvest. National parks There area three national parks make up region 12 (Nakhon Sawan) of Thailand's protected areas. Mae Wong National Park, Khlong Wang Chao National Park, Khlong Lan National Park, Wildlife sanctuary Khao Sanam Phriang Wildlife Sanctuary, History Kamphaeng Phet was already a royal city in the Sukhothai Kingdom in the 14th century, then known under its old name Chakangrao. It formed an important part of the defence system of the kingdom, as well as of the later Ayutthaya Kingdom. Symbols The provincial seal shows the city walls surmounted by diamonds, since the city name means 'diamond wall' (from the shape of the ramparts of the old city wall). The provincial tree is the areca nut palm (Acacia catechu), and the provincial flower the bullet wood (Mimusops elengi). Golden belly barb (Hypsibarbus wetmorei) is provincial fish, since it is a fish found in the Ping