Lake Manyara National Park

Lore & Background

Since the 1920s, the Lake Manyara area was used for sports hunting. In 1957, a game reserve was established, and in 1960 it was given National Park status. In 1974, about 550 ha were added to the southern end. The majority of the park's land area is a narrow strip running between the Gregory Rift wall to the west and Lake Manyara, an alkaline lake, to the east. The park only includes the northwest quadrant of the lake, about 200 km². It is part of the much larger Lake Manyara Biosphere Reserve, established in 1981 by UNESCO as part of its Man and the Biosphere Programme.

The park has two rainy seasons: short rains from November to December and long rains from March to May. The warmest months are January, February, and March, averaging 30°C, while the coolest are June and July, averaging 25°C. The adjacent highlands tend to be cooler with more rainfall. The lake is shallow and alkaline, formed in a depression in the Rift Valley System, with no outflow but fed by underground springs and permanent streams. Its depth and area fluctuate significantly; in extreme dry periods it has dried up completely.

More than 390 bird species have been documented in the park, including thousands of flamingos that feed along the lake edge in the wet season. The groundwater forest is a breeding site for pink-backed pelican and yellow-billed stork. Over 40 species of birds of prey are documented. Large migratory mammals include blue wildebeest, zebra, Thomson's gazelle, and Grant's gazelle. The park's flora includes over 670 flowering plant and fern species, with diverse habitats such as groundwater forests, acacia woodlands, swamps, and grasslands.

Reader's Guide

Lake Manyara National Park is significant as a protected area that conserves a unique ecosystem between the Great Rift Valley escarpment and an alkaline lake. Its designation as a national park in 1960 and inclusion in the UNESCO Lake Manyara Biosphere Reserve in 1981 highlight its importance for biodiversity and sustainable development. The park is a key site for bird conservation, with over 390 species documented, including large flocks of flamingos and breeding colonies of pelicans and storks. It also serves as part of a wildlife migration corridor connecting Tarangire National Park and the Engaruka Basin, facilitated by the Kwa Kuchinja corridor and Manyara Ranch. The park's diverse habitats—from groundwater forests to alkaline flats—support a wide range of flora and fauna, including over 670 plant species. Its legacy includes providing a protected area for migratory mammals and waterbirds, while its location near Arusha makes it accessible for conservation and tourism. The park's management by the Tanzania National Parks Authority ensures ongoing protection of this ecologically sensitive region.

Did You Know?

• The park covers 325 km², including about 230 km² of lake surface.
• More than 390 bird species have been documented in the national park.
• The lake has no outflow and is fed by underground springs and streams from the Ngorongoro Highlands.
• In 1991, an estimated 1,900,000 non-breeding lesser flamingo individuals were recorded.

Rift-Valley Geology and the Shifting Lake

Lake Manyara sits at roughly 960 metres above sea level, cradled in a depression within the Great Rift Valley. The lake has no outflow; it is sustained entirely by underground springs and a handful of permanent streams draining the Ngorongoro Highlands. In a full wet season it can stretch forty kilometres wide by fifteen kilometres long, reaching a maximum depth of about 3.7 metres and covering roughly two-thirds of the park. Yet the water is never deep—bathymetric work in 2010 recorded an average depth of just 0.81 metres and a peak of barely 1.18 metres. In prolonged droughts the surface shrinks, and on at least one occasion the lake has evaporated to nothing. To the west, the Gregory Rift wall climbs steeply to between 1,219 and 1,829 metres, its slopes dotted with towering African baobabs. The geothermal story is equally striking: the Maji Moto hot spring on the western shore pushes water at 60 °C after it has percolated through volcanic magma rock beneath the rift, while two additional hot springs bubble near the park's centre and southern edge. A hippopotamus pool at the lake's northern tip completes a landscape shaped by tectonic force and volatile water.

A Mosaic of Habitats and Plant Life

The park's flora is remarkably varied, with more than 670 flowering plant and fern species documented, though most are widespread rather than rare or endemic. Rivers spilling off the escarpment and perennial springs below the rift wall sustain tall, evergreen groundwater forests dominated by Trichilia roka alongside broad-leaved croton, sycamore fig, quinine tree, and forest toad-tree. At the forest's edge, dense stands of yellow fever trees and Phoenix reclinata palms give way to irregular woodlands of Acacia tortilis, whose flat-topped canopies rise to about ten metres over a patchy shrub understory. Where the Simba River and its tributaries meet the lake's northern end, extensive swamps have formed, hosting two species of water lily, thick mats of water lettuce, pure stands of cattail, and various Cyperus sedges. Extensive marshlands and saline flats border the lake, the latter expanding in the dry season as the waterline recedes. A grassy floodplain and a tall forest of evergreen fig and mahogany near the park gate round out the mosaic. More than 350 bird species have been recorded on the lake, underscoring the ecological richness of these layered habitats.

From Sports Hunting to Biosphere Reserve

The land now protected as Lake Manyara National Park has a layered conservation history. In the 1920s the area served as a sports-hunting ground; a game reserve was not established until 1957, and three years later, in 1960, it was elevated to National Park status under the Tanzania National Parks Authority. A further 550 hectares were annexed to the southern end in 1974, bringing the total to 325 square kilometres, of which about 230 square kilometres is lake surface. The park encompasses only the northwest quadrant of the lake, roughly 200 square kilometres of the water body. In 1981 UNESCO designated the broader area as the Lake Manyara Biosphere Reserve under its Man and the Biosphere Programme. Connectivity is a key theme: the Kwa Kuchinja corridor to the east links the park with Tarangire National Park to the southeast and the Engaruka Basin to the north, while the 45,000-acre Manyara Ranch, managed by the Tanzania Land Conservation Trust since 2001, provides additional wildlife passage. The 35,399-hectare Marang Forest Reserve on the escarpment and the Lake Manyara Important Bird Area further extend the protected landscape.

Two Rainy Seasons and a Narrow Thermal Range

The park experiences two distinct rainy periods: the short rains from November through December and the long rains from March to May. April is the wettest month, averaging 161 millimetres of rainfall spread across 19 rainy days. The driest stretch falls in July, August, and September, when precipitation drops to just one millimetre; September also records the fewest rainy days at only two. Temperature variation is modest. January, February, and March are the warmest months, with average highs around 30 °C (86 °F), while June and July are the coolest, averaging 25 °C (77 °F) at their peak. The adjacent highlands, sitting at greater elevation, tend to be cooler and receive more rainfall than the lake basin itself. This seasonal rhythm directly drives the lake's fluctuating surface area and the expansion of saline flats during the dry months, making the park's ecology a living barometer of the East African climate cycle.