Lake Duluti is a small crater lake at Tengeru, about 15 kilometres east of Arusha on the road toward Moshi, surrounded by a forest reserve of around 170 hectares.
The lake fills an old volcanic crater on the lower slopes of Mount Meru, and its steep forested rim gives it a sheltered, enclosed feel quite unlike the open country nearby.
It is not a wildlife destination in any conventional sense. The draw is a walking trail circling the rim, canoeing on the water, and birdlife, with well over a hundred species recorded including fish eagle, kingfishers and herons.
Its proximity to Arusha makes it one of the easiest half-day outings on the northern circuit, and it works particularly well as a gentle first activity for visitors arriving jet-lagged before a safari.