Green Mountain, Mountain summit in Saint Helena.

Green Mountain, also called The Peak, is a stratovolcano and the highest point of Ascension Island at 859 m. Its slopes are built of pyroclastic fall deposits, mainly pumice, with trachyte on the southwest flanks. A road from Georgetown leads partway up; a footpath continues past old barracks and a disused water catchment to an observation station and the Dew Pond, with the summit marked by an anchor chain.

Charles Darwin visited Ascension in July 1836 and found the island nearly treeless. In 1843 the botanist Joseph Dalton Hooker, on Ross's Antarctic expedition, proposed planting the slopes to increase rainfall and ease life for the garrison. Kew Gardens alone sent 330 species; by 1865 an Admiralty report recorded thickets of 40 kinds of trees and an improved water supply.

The name Green Mountain replaced the older local name The Peak, still used by islanders. Since 2005 the summit has been a national park, and seven walking trails with picnic and camping areas are maintained for visitors. The anchor chain marking the highest point, just above the Dew Pond, is a landmark walkers look for.

Weather on the mountain can change quickly, so check conditions before heading up and wear layers that suit the climate. Different trails have varying difficulty levels and offer different views and experiences depending on your fitness and preferences.

The mineral dalyite was first identified here in 1952, at a site on Green Mountain. The mountain is also the type locality for this rare mineral, which makes it a reference point for geologists studying the island's volcanic rocks.