Mongar District (Dzongkha: མོང་སྒར་རྫོང་ཁག་; Wylie: Mong-sgar rdzong-khag) is one of the 20 dzongkhags (districts) comprising Bhutan. Mongar is the fastest-developing dzongkhag in eastern Bhutan. A regional hospital has been constructed and the region is bustling with many economic activities. Mongar is noted for its lemon grass, a plant that can be used to produce an essential oil. It also has a hydroelectric power-plant on the Kuri Chhu river. Mongar is notable for having the longest work time in all the dzongkhags of Bhutan.