Horton Plains National Park

Lore & Background

The original name of the area was Maha Eliya Thenna, meaning 'great open plain.' During the British period, the plains were renamed after Sir Robert Wilmot-Horton, the British governor of Ceylon from 1831 to 1837, who traveled there in 1836. Stone tools dating back to the Balangoda culture have been found here. The park was designated a wildlife sanctuary on 5 December 1969 and elevated to a national park on 18 March 1988. In July 2010, the Central Highlands of Sri Lanka, which incorporates Horton Plains National Park, was inscribed on the World Heritage List.

The park features the sheer precipice of World's End, a cliff with an 870 m drop, and Baker's Falls, a 20 m waterfall formed by Belihul Oya. The vegetation includes montane grasslands and subtropical montane evergreen forests, with nearly 750 plant species recorded. The largest and most commonly seen mammal is the sambar deer, with an estimated population of 1,500 to 2,000. The park is also an Important Bird Area, with many species endemic to Sri Lanka and restricted to the Horton Plains.

Reader's Guide

Horton Plains National Park is significant as a protected area that preserves a unique montane ecosystem in Sri Lanka's central highlands. Its designation as a national park in 1988 and inclusion in the Central Highlands World Heritage Site in 2010 underscore its global importance. The park's biodiversity is notable: nearly 750 plant species, 24 mammal species, 87 bird species, and many endemic forms. The Horton Plains slender loris, a subspecies found only in the highlands, is considered one of the world's most endangered primates. The park also serves as a critical drainage basin, feeding three major rivers. Threats include forest dieback, which some studies suggest is a natural phenomenon. The park's attractions—World's End and Baker's Falls—draw visitors, while its grasslands and cloud forests provide habitat for species such as the Sri Lankan leopard and sambar deer. The legacy of Horton Plains lies in its role as a refuge for endemic flora and fauna and as a key watershed for Sri Lanka.

Did You Know?

• Stone tools dating back to Balangoda culture have been found in Horton Plains.
• The park is the headwaters of the Mahaweli, Kelani, and Walawe rivers.
• World's End is a sheer cliff with an 870 m drop.
• The Horton Plains slender loris is found only in the highlands of Sri Lanka and is one of the world's most endangered primates.

The High Plateau Landscape

Perched on the southern edge of Sri Lanka's central highlands, Horton Plains National Park occupies a dramatic stretch of elevated terrain where elevations climb from roughly 1,200 metres to 2,300 metres. The park is flanked by two of the island's tallest summits: Kirigalpoththa at 2,389 metres to the west and Thotupola Kanda at 2,357 metres to the north, the second and third highest mountains in the country. Beneath the surface, the bedrock belongs to the Archean age and the high series of the Precambrian era, composed of khondalites, charnockites, and granitic gneisses, while the overlying soil falls into the red-yellow podsolic group, its top layer enriched by decayed organic matter. The climate is cool and wet, with mean annual rainfall exceeding 2,000 mm and a mean annual temperature of just 13 °C. Yet daily swings are dramatic—daytime highs can reach 27 °C while nighttime lows dip to 5 °C, and ground frost is a regular occurrence in February. The park's most iconic feature is World's End, a sheer precipice plunging 870 metres into the valley below, while Baker's Falls, a 20-metre cascade on the Belihul Oya, and Slab Rock Falls add further drama to the landscape.

The Island's Water Tower

Horton Plains is widely regarded as the most important drainage basin in Sri Lanka, serving as the headwaters for three of the country's major rivers: the Mahaweli, the Kelani, and the Walawe. Beyond these, the plateau also feeds several smaller waterways, including the Belihul Oya, Agra Oya, Kiriketi Oya, Uma Oya, and Bogawantalawa Oya. This hydrological significance is reflected in the park's numerous pools, waterfalls, and slow-moving streams that thread through its low-lying areas. Baker's Falls, a 20-metre cascade formed by the Belihul Oya—a tributary of the Walawe—was named in honour of Sir Samuel Baker, while Slab Rock Falls offers another notable drop. In the wetter, waterlogged zones, macrophytes such as Aponogeton jacobsenii, the sedge Isolopis fluitans, and bladderwort species (Utricularia) colonise the margins of sluggish streams, while the bamboo Chimonobambusa densifolia thrives along their banks. The combination of heavy rainfall, persistent mist during the wet season, and the plateau's elevated position makes this a critical source of freshwater for the island's populations and ecosystems downstream.

A Living Tapestry of Flora

The park's vegetation divides into two strikingly different communities: roughly 2,000 hectares of wet patna—open montane grasslands and shrublands—and about 1,160 hectares of subtropical montane evergreen forest. Together they support nearly 750 recorded plant species across 20 families. The forest canopy, reaching heights of around 20 metres, is dominated by Calophyllum walkeri, which forms mixed communities with Myrtaceae members such as Syzygium rotundifolium and S. sclerophyllum, as well as Lauraceae species including Litsea, Cinnamomum, and Actinodaphne speciosa. Beneath the canopy, dense stands of Strobilanthes create a thick undergrowth that effectively suppresses a separate herb layer, while dwarf bamboos like Indocalamus and Ochlandra add further structural complexity. At forest margins and near the peaks, Rhodomyrtus tomentosa shrubs are a common sight. Of the 54 woody plant species recorded, a remarkable 27—half the total—are endemic to Sri Lanka. The grasslands themselves are shaped by frequent fire and grazing, dominated by Arundinella villosa and Chrysopogon zeylanicus, and the park holds the most extensive surviving cloud forest on the island.

From Ancient Plain to World Heritage

The area long known to locals as Maha Eliya Thenna, meaning 'great open plain,' carries deep human history, with stone tools from the Balangoda culture discovered on the plateau. During the British colonial period, the landscape was renamed in honour of Sir Robert Wilmot-Horton, governor of Ceylon from 1831 to 1837, who in 1836 travelled to the region to meet the Ratemahatmaya of Sabaragamuwa. The plateau had been 'discovered' by British officers just two years earlier, in 1834, by Lieutenant William Fisher of the 78th Regiment and Lieutenant Albert Watson of the 58th. Lowland communities had long ascended the mountains to mine gems, extract iron ore, build irrigation canals, and fell timber. A turning point came when Sir Joseph Dalton Hooker advised the British government to leave all montane forests above 5,000 feet undisturbed, leading to an 1873 administrative order that banned clearing and felling. The area was formally designated a wildlife sanctuary on 5 December 1969, then elevated to national park status on 18 March 1988. In July 2010, as part of the Central Highlands of Sri Lanka, it was inscribed on the UNESCO World Heritage List.