The Thoubal River Valley Multipurpose project, now known as Mapithel Dam, is a mega dam. The project is implemented in Mapithel area in Phungyar subdivision of Ukhrul district targeting to irrigate 21,000 hectares of cultivable land besides giving 10 million gallons of drinking water every day and supply 7.5 MW of power. It is one of the biggest dams in the North-East India. It is 66 meter high and 1034 meter long. The main purpose of the project is to utilize the water resource of the Yangwui Kong (Local name) river which originates in the western hill slopes of Shiroi Hills and Hoomi in the Ukhrul District. Both the rivers joined at Lamlang village, flowing through the Thoubal District before joining the Imphal River at Irong Ichil.