Swirly flow lines of volcanic glass (obsidian) within a piece of lava at Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Mounts Lokon on the left, and Empung, with Tompaluan active crater on the saddle between, two volcanoes near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Fertile volcanic soil fields with Mount Lokon peak, an active stratovolcano beyond, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Stress cracks in the skin of a large fallen lava bomb near Mount Lokon, an active stratovolcano, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Mount Mahawu, a stratovolcano and active 180m wide crater, with Lokon on the left, and Empung volcanoes beyond, Gunung Mahawu, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Sulphur deposits in a piece of lava rock on the slopes of Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Sulphurous fumaroles and volcanic strata in Tompaluan active crater on the flank of Mount Lokon, a volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia Indonesia

Steaming fumaroles, sulphur and volcanic strata in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

The peak of Mount Lokon, a stratovolcano with Tompaluan active crater on its flank, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumarole with sulphur deposits in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Mount Lokon volcano with Tompaluan active crater on the saddle between next door Mount Empung, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Steaming fumaroles, sulphur and volcanic strata in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Mount Mahawu, a stratovolcano and active 180m wide crater, with Lokon on the left, and Empung volcanoes beyond, Gunung Mahawu, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia