Ol Donyo Lengai, 2878m (9650ft), is an active volcano in northern Tanzania. It is located in the Rift Valley, in the heart of Masaai country, and locally regarded as a sacred mountain. Looking north from its summit crater the hot barren salt flats of Lake Natron stretch into the distance, beyond lies the Kenyan border. The day temperatures by the lake often exceed 40°C (100°F), few animals survive here and only the flamingo makes the lake its home, nesting on the salty surface on upraised mounds where slightly cooler air stops its eggs getting fried! To the south stretch the Crater Highlands, Ngorongoro being one of the prime game parks in Africa. The eastern horizon is dominated by Kilimanjaro and to the west the forested escarpments and hills comprising the western slopes of the Great African Rift Valley. Almost without fail, about every seven years Lengai erupts and plumes of smoke billow out of the crater. At other times it is possible to walk down into the crater, almost to the edge of the molten lavas. The ascent of Lengai is demanding on account of the day time heat, lack of water, steep and unstable slopes of ash and crumbly rocks. An early start is recommended and the best approach is from the west where the morning sun can be avoided for a while.

The walk starts from Ngorongoro Crater rim and then continues to Nainokanoka, Olmoti, Embakai Crater, Oldoinyo Lengai finishing at Lake Natron. The cost is 780$ per person minimum 2 people. This rate includes; Transfer to/from the pick up points, all park entrance fees, village fee, camping fee, porter, ranger, guide donkey, camping gear, donkey escort and meals.