Exploring the Alkaline Momella Lakes of Arusha National Park

Momella Lakes consists of seven distinct alkaline water bodies located within the north-eastern sector of Arusha National Park. These lakes—Big Momella, Small Momella, Kusare, El Kekhotoito, Rishateni, Lekandiro, and Tulusia—were formed approximately 250,000 years ago when a massive eruption of Mount Meru displaced volcanic debris across the local topography. Positioned at an average elevation of 1,500 meters, the cluster is primarily fed by underground springs rather than surface runoff. This subterranean inflow maintains high concentrations of minerals, specifically sodium carbonates, which dictate the unique limnological profile of each basin.

Hydrology and Volcanic Origin of the Seven Lakes

Differentiation of Water Chemistry and Algal Hues

Each of the seven lakes displays a different shade of green or turquoise despite their geographic proximity. These variations stem from the specific mineral levels and the types of algae (principally cyanobacteria) that inhabit the water. Big Momella tends to maintain a deeper blue-green appearance due to its greater depth, while the shallower Kusare often exhibits a more vibrant, opaque green. Because the water is highly alkaline, most mammals avoid drinking directly from the lakes; instead, you will see them congregating on the grassy banks to graze on the salt-tolerant vegetation.

Geological History from the Mount Meru Eruption

The formation of these basins is a direct result of the Mount Meru debris avalanche. When the eastern wall of the volcano collapsed, a mixture of mud, water, and rock surged downward, creating a series of depressions in the uneven terrain. Over millennia, these hollows filled with groundwater. The proximity to Mount Meru—Tanzania's second-highest peak at 4,566 meters—still influences the local climate, often trapping moisture and creating the dense forests that surround the lake system. This specific geological event distinguishes Momella from other Rift Valley lakes, which are typically tectonic in origin.

Practical Safari Logistics and Activities

Canoeing on Small Momella Lake

Canoeing is restricted to Small Momella Lake and offers a rare opportunity to engage with the environment outside of a vehicle. A standard two-hour paddle costs roughly $20 per person (excluding park entry and VAT) and usually starts near the southern jetty. From the water, you get a perspective on the shoreline that is impossible from the road; giraffes often stand just yards away from the canoes to watch the boats pass. While hippos are constant residents, the guides follow strict safety routes to keep a respectful distance from their deep-water territories. I recommend starting your session by 9:00 AM to avoid the midday sun and to catch the calmest water reflections.

Avian Diversity and Seasonal Flamingo Movements

The lakes are a critical habitat for over 600 bird species, including both resident populations and Palearctic migrants. Lesser flamingos are the most visible inhabitants, often appearing in thousands to feed on the spirulina algae in the shallows. Greater flamingos also frequent the lakes, using their longer legs to wade into deeper sections for crustaceans. The best time for birdwatching is between November and April when migratory species from Europe and North Africa arrive. During these months, you might see yellow-billed storks, Egyptian geese, and various species of kingfishers competing for space along the reed beds.

The Momella Lakes Viewpoint and Picnic Planning

A dedicated viewpoint sits atop a hill west of the lakes, offering a panoramic look at the entire chain against the backdrop of Mount Kilimanjaro on clear days. This site is equipped with concrete benches and serves as the primary picnic area for day-trippers. To reach it, you must navigate a slightly steep 4x4 track that branches off the main park loop—a detail many self-drive visitors miss because the signage is small. The viewpoint is also an excellent spot to witness the distinct color boundaries between the different lakes, which are much more apparent from an elevated angle than from the shore.

Frequently Asked Questions

What are the total entrance fees for Momella Lakes?

A non-resident adult must pay $50 USD for a 24-hour permit to Arusha National Park, which covers the Momella Lakes area. An additional 18% Value Added Tax (VAT) is applied at the gate, bringing the total to $59 USD per person. Payments are typically made via credit card at the Ngongongare or Momella gates.

Can you walk around the lakes without a ranger?

Walking is permitted in certain areas near the Momella Lakes, but an armed park ranger is mandatory for any treks outside designated picnic zones. This requirement ensures safety due to the high density of buffalo and hippos in the tall grass. Ranger fees are approximately $20 per group for a two-hour walking safari.

When is the best time of year to see flamingos?

Flamingo numbers peak during the dry season from July to October when water levels drop and salt concentrations increase. However, significant flocks can still be seen throughout the wet season if the algae blooms are sufficient. Since their movements are nomadic across East Africa, sightings are frequent but depend on current water salinity.

Is there accommodation available directly at the lakes?

Hatari Lodge is the most prominent accommodation located on the northern border of the park, positioned very close to the lakes. There are also public and special campsites managed by the national park authority within the park boundaries. Most travelers visit the lakes as a day trip from Arusha city, which is only a 45-minute drive away.