Lake Duluti is a volcanic crater lake in the Arusha region of Tanzania, on the eastern edge of the eastern branch of the Great Rift Valley. It is located in Meru District near the town of Tengeru and is 14 kilometres (14 km) from Arusha city centre and 1.31 kilometres from the Arusha-Moshi road. 

Lake Duluti covers about 0.66 km², and the surrounding Lake Duluti Forestry Reserve covers about 19 hectares (47 acres) of land. The deepest part of the lake, in its center, is about 9 m (30 ft) deep; the shallow parts are at the lake's shore, where the depth varies from side to side.

Lake Duluti is formed inside a volcanic crater and has water throughout the year, mainly from groundwater and seasonal rainfall. The crater is a subsidiary vent to Mount Meru (4566 m) that towers over the lake. 

The natural forest roundabout the lake is teeming with wildlife including blue monkeys, snakes and lizards; different bird species including grey herons, fish eagles, cormorants, ospreys and kingfishers. The Reserve has variety of different tree species.

Ecotourism Activities
Kayaking, Canoeing, Sport Fishing, Bird Watching, Forest Walk, Picnic Camping, Filming and Photographing