Abijatta-Shalla Lakes

Abijatta-Shalla Lakes National Park protects two contrasting soda lakes in the central Ethiopian Rift Valley, in Oromia Region. Covering approximately 887 square kilometres, the park encompasses the shallow, highly alkaline Lake Abijatta and the deeper, almost fresh Lake Shalla, separated by a narrow land bridge. Designated a national park in 1963, the area is internationally recognized as a critical stopover for migratory waterbirds, hosting tens of thousands of Lesser and Greater Flamingos as well as pelicans. The lakes lie within the East African Rift System and are surrounded by acacia woodland, hot springs, and geothermal vents. The juxtaposition of two lakes with dramatically different chemistries within a single protected area makes Abijatta-Shalla ecologically unique on the continent.

Abijatta-Shalla is renowned for its extraordinary bird diversity, with over 300 species recorded. Lake Abijatta's alkaline shallows support vast breeding colonies of Lesser Flamingo (Phoeniconaias minor) and Greater Flamingo (Phoenicopterus roseus), often numbering in the tens of thousands. Great White Pelicans (Pelecanus onocrotalus) roost on Lake Shalla's islands, which also serve as one of Africa's most significant pelican nesting sites. Other waterbirds include African Fish Eagle, various stork species, and numerous waders. Terrestrial mammals inhabiting the acacia woodland and grassland margins include Grant's gazelle, common warthog, Anubis baboon, spotted hyena, and golden jackal. The alkaline ecosystem surrounding Lake Abijatta supports specialist invertebrate communities that underpin the flamingo food chain.

Vegetation around Abijatta-Shalla reflects the semi-arid Rift Valley climate. Acacia woodland dominated by Acacia tortilis and Acacia senegal covers much of the upland areas and acts as habitat for woodland bird species and small mammals. The shorelines of Lake Abijatta are largely devoid of higher plant life due to extreme salinity, supporting only cyanobacteria and halophytic algae that sustain the flamingo population. Around Lake Shalla, which has somewhat lower salinity, patches of emergent vegetation including Typha and Phragmites reed beds provide nesting cover. Grassland communities on drier terraces contain Themeda triandra and various annual forbs that support grazing ungulates. Small groves of wild fig (Ficus spp.) occur near freshwater seeps.

The twin lakes occupy a segment of the East African Rift Valley, one of the world's great tectonic features formed by the separation of the Somali Plate from the Nubian Plate. Lake Abijatta sits in a shallow volcanic basin at an elevation of approximately 1,578 metres, while Lake Shalla, despite being adjacent, occupies a deep graben that drops to 260 metres depth—one of Africa's deepest rift lakes. Lake Shalla's basin is of volcanic origin, and numerous hot springs and fumaroles along its shoreline attest to ongoing geothermal activity. The surrounding terrain is composed of Quaternary volcanic rocks including basalt flows, rhyolite tuffs, and lacustrine sediments. Hydrothermal vents pump mineral-rich water into Shalla, influencing its chemistry.

The park experiences a semi-arid tropical climate modulated by its Rift Valley position at around 1,600 metres elevation. Two rainy seasons occur: the belg (short rains) from March to April and the kiremt (main rains) from June to September. Annual rainfall averages 500–600 mm, much of it concentrated in the kiremt season. Temperatures are warm year-round, with mean daily highs between 25°C and 30°C and cooler nights. The dry season from October to February is the best time for flamingo viewing, as water levels in Lake Abijatta drop and birds concentrate in dense flocks. Harmattan-like winds can raise dust from the exposed lake bed during the driest months.

The lakes and surrounding lands have been inhabited by Oromo pastoralists for centuries, who used the area for dry-season grazing and fishing on Lake Shalla. Traditional Oromo land-management practices shaped the savanna and woodland landscape. Italian cartographers and naturalists documented the lakes during the colonial-era surveys of the early 20th century. After Ethiopian independence, the lakes were incorporated into the national park system in 1963, though local communities continued to access resources within the park boundaries, creating ongoing management tensions. Industrial soda ash extraction from Lake Abijatta began in the 1990s and dramatically lowered water levels, causing widespread flamingo population decline and international conservation concern.

Abijatta-Shalla Lakes National Park was gazetted in 1963, making it one of Ethiopia's earliest formal protected areas. The Ethiopian Wildlife Conservation Organization (EWCO, now EWCA) assumed management responsibility. The park gained international prominence through surveys by ornithologist Leslie Brown in the 1960s–70s, who documented the flamingo colonies. In the 1990s, state-sanctioned soda ash mining operations in Lake Abijatta caused its surface area to shrink dramatically, triggering conflict between the mining conglomerate, conservation authorities, and development agencies. Conservation efforts by the Ethiopian government and NGOs since the 2000s have sought to restore the lake level and renegotiate mining boundaries. The park remains officially protected but faces ongoing threats from extraction and illegal wood fuel collection.

The main visitor circuit follows the shoreline of Lake Abijatta, where elevated viewing points afford panoramic views of flamingo aggregations—most spectacular from November to February. A land bridge between the two lakes provides a viewpoint over both water bodies simultaneously. Lake Shalla's hot spring beach on the southeastern shore, where water at near-boiling temperatures emerges, is a striking geological attraction. Boat trips on Lake Shalla offer access to the pelican nesting islands and views of the steep caldera walls. Birdwatching hides near the Lake Abijatta shoreline are the park's most visited facility. The drive along the Rift Valley escarpment provides wide views of the lakes and the distant Arsi Mountains.

The park entrance and main ranger station is located at Dila, approximately 200 kilometres south of Addis Ababa on the main road to Hawassa and Arba Minch. The town of Ziway, 25 kilometres north, serves as the main service hub for accommodation, food, and fuel. Inside the park, facilities are basic—a ranger post, pit latrines, and a small interpretive display. There are no permanent lodges within the park; most visitors stay in Ziway or Hawassa. A four-wheel-drive vehicle is recommended, particularly during the rainy season, as the internal tracks become muddy and impassable. Entry fees are paid at the main gate. Hiring a local guide at the gate is advisable for locating flamingo concentrations.

Abijatta-Shalla faces severe conservation challenges. Industrial soda ash extraction from Lake Abijatta between the 1990s and 2000s caused the lake surface to shrink by more than 50%, devastating flamingo habitat. Illegal logging for charcoal and firewood has degraded the surrounding acacia woodland. Overgrazing by livestock from neighbouring communities has eroded grassland areas. Conservation agencies including the Ethiopian Wildlife Conservation Authority (EWCA) and international partners such as the African Bird Club and BirdLife International have campaigned for stricter protection. Restoration efforts have focused on improving water inflows by reducing extraction and rehabilitating riparian vegetation. The park is classified as an Important Bird and Biodiversity Area (IBA) and is a candidate for Ramsar wetland designation.