Horton Plains is a highland plateau in Sri Lanka’s Central Highlands at about 2,100–2,350 m above sea level, making it one of the highest plateaus on the island. It features rolling grasslands, montane cloud forests, marshes, and wet patana vegetation. The Plains are bounded by Kirigalpoththa (2,389 m) and Thotupolakanda (2,357 m), the second and third highest peaks in Sri Lanka.
The climate is wet montane with cool temperatures — average around 13–16 °C, often dropping to ~5 °C at night in cooler months, with ground frost possible in the dry season. Annual rainfall is high (often >2,500 mm and locally much more), especially during monsoon and inter-monsoon periods.