Mount Pinatubo Crater Lake Trek

Mount Pinatubo erupted on June 15, 1991 in what was the second-largest volcanic eruption of the 20th century — 10 cubic kilometres of magma blasted into the stratosphere, lowering global temperatures by 0.5 degrees for two years and completely reshaping the landscape of western Luzon. Three decades later, that catastrophic event has created one of the most extraordinary trekking destinations in Southeast Asia.

The approach from O'Donnell basecamp is itself a spectacle: your 4x4 Jeepney fords lahar rivers through canyons of grey volcanic mud up to 30 metres deep, the walls still being slowly cut by flash floods decades after the eruption. It looks like a grey version of the American Southwest's canyon country — and the scale is surreal. The trek begins at the second basecamp and follows a well-marked trail through volcanic badlands where nothing grows except sparse cogon grass, past steaming fumaroles, and up the outer caldera rim.

The crater lake at the summit is the reward: a perfectly calm turquoise-green lake nestled inside the caldera, its colour caused by dissolved minerals and the angle of the sky reflected in water that is several hundred metres deep. The lake has grown steadily since the eruption and the rim continues to erode — no two visits look quite the same. Lunch is eaten at the crater rim while watching sulphur steam rise from vents on the far side. The Aeta guides — the indigenous Zambaleño people who lived on Pinatubo's slopes before the eruption and have returned to their ancestral territory — tell their evacuation stories with remarkable equanimity, making the human dimension of this geological story as moving as the landscape itself.