Mount Tondano - AbsoluteAstronomy.com

Mount Tondano in the province of North Sulawesi

North Sulawesi

North Sulawesi is a province of Indonesia. It is on the island of Sulawesi, and borders the province of Gorontalo to the west . The islands of Sangihe and Talaud form the northern part of the province, which border Davao del Sur in the Philippines.The capital and largest city in North Sulawesi is...

, Sulawesi

Sulawesi

Sulawesi is one of the four larger Sunda Islands of Indonesia and is situated between Borneo and the Maluku Islands. In Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra have larger Indonesian populations.- Etymology :The Portuguese were the first to...

, Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

, contains 20 × 30 km wide of Quaternary

Quaternary

The Quaternary Period is the most recent of the three periods of the Cenozoic Era in the geologic time scale of the ICS. It follows the Neogene Period, spanning 2.588 ± 0.005 million years ago to the present...

caldera

Caldera

A caldera is a cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption, such as the one at Yellowstone National Park in the US. They are sometimes confused with volcanic craters...

. Pyroclastic cones, obsidian

Obsidian

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth...

flows and geothermal areas are observed in the caldera area. The Lake Tondano lies in the east side of the caldera.

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