Ol Doinyo Lengai Climb and Lake Natron

Ol Doinyo Lengai, which means Mountain of God in the Maasai language, is an active volcano in the Great Rift Valley, north of Arusha and close to the Kenyan border. It rises to about 2,900 metres from the floor of the rift and is famous for erupting unusual lava called carbonatite, which is black when fresh and turns white as it cools. For climbers who want a different kind of mountain adventure, this three-day trip combines a night ascent of Lengai with time at nearby Lake Natron. The climb is short but severe. It starts around midnight, to reach the crater before sunrise and avoid the worst heat, and it climbs steeply over loose ash and rock on a slope that can feel almost vertical in places. Many people find it harder than expected, not because of altitude but because of the gradient and the loose footing, and it takes several hours. The reward is a view into the crater and across the rift valley at dawn, with the shimmering lake and the escarpment below. After the climb and a rest, the trip usually includes time at Lake Natron, a salt lake that is a major breeding ground for lesser flamingos. The scenery is stark and otherworldly, with red-tinged water, mudflats and heat haze. A walk to nearby waterfalls and river pools is a typical cooling-off activity.

This is a remote area and the journey is part of the adventure. From Moshi the drive is long and the final stretch to the Lake Natron area is on rough tracks, so a 4x4 is essential. Accommodation is usually in simple camps or lodges near the lake, and facilities are basic. The heat can be intense, so sun protection, a hat, plenty of water and light clothing are necessary, while the summit climb itself is cold and windy in the early hours, so bring a warm layer.

Fitness and footing are the main requirements. The ash slope is loose, so sturdy boots and trekking poles help, and gaiters keep grit out. Do not attempt the climb if you have a fear of heights or knee problems. Guides will take their time, but you must be prepared for a hard, steep ascent and descent.

Be aware that the volcano is active. Conditions can change, and guides and local authorities will advise whether the crater is safe to approach. Respect any restrictions, and do not go near the crater edge without the guide. The Maasai consider Lengai sacred, so be respectful when visiting and ask before photographing local people.

Check the details of what the trip includes: park or conservation fees, camping or lodge nights, meals, the guide and vehicle. The best time is the dry season, June to October, when tracks are firmer. Our Arusha pages has the Maasai village visit and the Lake Eyasi cultural day if you want to add more of the rift valley's people and landscapes to the itinerary.

Pack lightly but carefully. Along with boots and layers, bring a dust mask or buff for the ash, spare socks, wet wipes, a reusable water bottle and a small first-aid kit. Mobile coverage is poor in the rift, so tell family where you are going and when you expect to be back, and keep cash for small purchases and tips in local villages.