The Ing River
(อิง) is a tributary of the Mekong River
in the northern part of Thailand
. It is about 300 km long and its flow varies seasonally due to the tropical forest
climate in the region. Flood waters inundate the river basin during the rainy season, spurring migratory fish to enter the Ing from the larger Mekong for the purpose of spawning there. The intermittently flooded forest near its banks allow for ample spawning grounds for a wide variety of river-running fish. Many young and old fish go back downriver with the onset of the dry season. The native people of the Ing River watershed depend on catching migratory fish and other wild riverine animals for their survivial. Locals rely upon seasonal fish and their migration, and have learned to catch them with great skill, especially through the use of hundreds of small reservoirs and ponds.
At the town Phayao the river flows through the Phayao lake.