Lemyethna Township lies on the
Irrawaddy Delta and is centred around the
Ngawun River, which runs north–south through the township. 21 of the town's
village tracts lie to the east of the township, which is densely populated flat lowlands, and the remaining 22 village tracts lie in the hilly foothills of the
Arakan Mountains to the west of the Ngawun. The streams within the township are entirely
freshwater, allowing for ample drinking, transportation and irrigation uses. The township has a hot and rainy climate with an average rainfall of over an average of 80.6 rainy days a year. The lowest temperate and highest temperatures per year over the 2018-2023 period were 10.5 °C and 39.2 °C respectively. The Lemyethna Forest Reserve covers 44% of the township with of protected state-owned forest covering the township's western half. of this area is reserved for
hardwood forests, cultivating economically important
teak and
Pyinkado trees. The township has additional forested areas, mostly west of the Ngawun, containing various trees including
padauk and bamboo forests. These preserved forests are home to various fauna like wild hogs,
gaur, deer and monkeys. ==Demographics==