Kosum Phisai (, ; , ) is a district (amphoe) in the northern part of Maha Sarakham province, northeastern Thailand.
Located on Highway 208, the town centre, after incorporating the area of Hua Khwang Subdistrict Administrative Organization in 2020, became an area of 6.54 square kilometers, with a population of 9,226 people and 4,204 households. At Almost exactly halfway between the cities of Khon Kaen and Maha Sarakham, the neighbouring districts are (from the north clockwise): Chiang Yuen, Kantharawichai, Mueang Maha Sarakham, Borabue, and Kut Rang of Maha Sarakham Province: Ban Phai, Ban Haet, and Mueang Khon Kaen of Khon Kaen province.
Monkey Lake or 'Bung Ling' (à ¸Âà ¸¶à ¸ à ¸«à ¸¥à ¸´à ¸Â) as the forest is known locally, begins immediately in the Hua Khwang Subdistrict, a suburb some 500 metres from the town centre, and covers an area of approximately 175 rai (69 acres, 28 hectares). Bordered by the banks of the Chi River, the forest is a near-complete wetland ecosystem and features a natural 3 rai (about 1.2 acres) pond in the center that holds water year-round, with a depth of about 1-1.5 meters. In 2020, the Ministry of Natural Resources and Environment officially announced the area as a designated forest park. A major tourist attraction is the large population of over 1,000 semi-tame long-tail macaque monkeys.
Kosum Phisai is divided into 17 sub-districts (tambons), which are further subdivided into 235 administrative villages (mubans).
There is one sub-district municipality (thesaban tambon) in the district:
There are 17 sub-district administrative organizations (SAO) in the district: