Kwan Phayao (กว๊านพะเยา) Kwan means a large swamp or lake. It is also a local Lanna dialect used only in Phayao. Kwan Phayao is a large swamp in a nearly-half-circle-moon shape, whose northeastern part is indented. It was caused by the collapse of the earth’s crust 70 million years ago. Hugging Doi Mae Chai which is a high and long mountain range, Kwan Phayao is a gathering venue of 18 brooks. Later, in 1935, the Department of Fisheries established the Phayao Fresh-water Fishery Station at the origin of the Ing River. When the dam was constructed, it became a large swamp with an average depth of 1.5 metres. Kwan Phayao is the most important source of water in the province and the most significant fresh-water fishery venue of the upper northern region. Moreover, it is a tourist attraction of Phayao Province, covering an area of 12,831 rai and a habitat of various kinds of fish such as Pla Krai – spotted featherback fish, Pla Sawai – striped catfish, Pla Thepho – black ear catfish, Pla Chin – Scobranch catfish, Pla Nai – carp fish, and Pla Nin – Nile tilapia fish, cyprinus carpio, etc. The surrounding atmosphere is shady, where the view of the beautiful and complex undulating mountain range can be seen. On the bank of Kwan Phayao stand various restaurants within the public park, suitable for sitting and relaxing during the late afternoon, as well as, admiring the magnificent view of sunset. A row boat trip sightseeing is 20 baht for adult, 10 baht for children. There is a light waving rites by water clockwise in the important Buddhism ceremonies; Makha Bucha Day, Visahka Bucha Day and Asarnha Bucha Day at Wat Tilokka Aram, aged over 500 years, situated in the middle of Kwan Phayao.