Gunung Slamet, Active stratovolcano in Central Java, Indonesia.

Gunung Slamet is a broad stratovolcano in Central Java rising to 3,432 meters (11,260 feet). Its wide, gently sloping cone is built from two overlapping edifices and carries four craters at the rounded summit. The lower flanks are covered by dense dark green vegetation, while the upper slopes appear as bare blue-grey rock.

The earliest recorded eruption occurred on 11–12 August 1772, and 42 confirmed eruptions were counted by 18 September 2014. Activity in May 2009 emitted glowing lava into June, and after four quiet years the volcano erupted again on 18 September 2014, when a nearby forest was razed and authorities closed off a 2.5-mile radius.

The name Slamet is rendered in English as "Salvation Mountain" or "Mountain of Health". The mountain serves as a symbol and source of pride for the people of the Banyumasan region, the western part of Central Java known as Banyumas Raya. At its foot lie the Baturraden resort area, about 15 km from Purwokerto, and the Guci hot springs in Tegal Regency on the north side.

The climb from Bambangan village in Purbalingga takes six to eight hours along steep, often slippery trails. Warm clothing and rain gear are necessary as temperatures drop near the summit and rainfall is frequent.

Rainfall on the slopes is among the heaviest in Indonesia, exceeding 320 inches (8,000 millimeters) per year. Temperatures at the summit often drop below freezing at night, which is rare for a tropical region.