Longleng is located in the northern part of Nagaland, characterized by its heavily forested, hilly terrain. The town itself is situated on a ridge, offering panoramic views of the surrounding valleys and neighboring mountain ranges.
The region's physical geography is dominated by the Naga Hills, which are a part of the complex mountain system extending from the Himalayas. The Dikhu River, one of the most prominent rivers in Nagaland, flows through the district and forms a natural geographical boundary with the neighboring Mokokchung district. The area is rich in sub-tropical broadleaf forests, harboring a diverse array of flora and fauna, including rare orchids, medicinal plants, and various species of endemic birds.
