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Volcanoes of Java and the Lesser Sunda Islands

8.5S 115.0E

September 29th, 2012 Category: Volcanoes

Indonesia – August 31st, 2012

The chain of islands on the right side of this image belong to the northern archipelago of the Lesser Sunda Islands, including Bali, Lombok, Sumbawa, Flores and Wetar. The archipelago is volcanic in origin, with a number of still active volcanoes, such as Mount Rinjani on Lombok. Others, however, such as Kelimutu, on Flores, are extinct.

Visible on the left side of the image, west of the Lesser Sunda Islands chain, is the island of Java. Formed mostly as the result of volcanic eruptions, Java is the 13th largest island in the world and the fifth largest island in Indonesia. A chain of volcanic mountains, easily visible in this image, forms an east-west spine along the island.

Volcanoes on Indonesian Island Chain

8.6S 116.3E

January 4th, 2012 Category: Volcanoes

Indonesia - December 22nd, 2011

This orthorectified wide-swath ASAR image shows several islands in Indonesia: (from left to right) Java, Bali, Lombok and Sumbawa. Also visible at the top are Madura (left) and Saubi (center).

Many volcanic peaks can be seen on the islands. One of the most prominent is Mount Rinjani, on Lombok. This active volcano on Lombok rises to 3726 m, making it the second highest volcano in Indonesia. On the top of the volcano is a 6 km by 8.5 km caldera, partially filled by Segara Anak (Child of the Sea) lake. This lake is approximately 2000 metres above sea level and estimated at 200 metres deep.

 

Indonesia’s Lesser Sunda Islands

8.5S 116.6E

August 3rd, 2009 Category: Snapshots, Volcanoes

Indonesia - July 2nd, 2009

Indonesia - July 2nd, 2009

From left to right, the largest Indonesian islands visible here are Java, Bali, Lombok, Sumbawa, Sumba and Flores. All except Java are part of the Lesser Sunda Islands, or Nusa Tenggara, group.

The island of Bali, surrounded by coral reefs, lies 3.2 km (2 mi) east of Java. East to west, the island is approximately 153 km (95 mi) wide and spans approximately 112 km (69 mi) north to south; its land area is 5,632 km². The highest point is Mount Agung at 3,142 m (10,308 feet) high, an active volcano.

Lombok, east of Bali, is roughly circular, with a “tail” to the southwest, about 70 km across and a total area of about 4,725 km² (1,825 sq mi).

Sumbawa has an area of 15,448 km² (three times the size of its western neighbor Lombok). It is a volcanic island, lying within the Pacific Ring of Fire, including the volcano Mount Tambor.

Finally, the island of Sumba has an area of 11,153 km². There is a dry season from May to November and a rainy season from December to April.

The Lesser Sunda Islands

8.5S 121.8E

June 28th, 2009 Category: Snapshots

Lesser Sunda Islands - June 23rd, 2009

Lesser Sunda Islands - June 23rd, 2009

The Lesser Sunda Islands, also called the Nusa Tenggara, are a group of islands in the middle-south part of Maritime Southeast Asia. Together with the Greater Sunda Islands to the west they make up the Sunda Islands. The islands are part of a volcanic arc, the Sunda Arc, formed by subduction along the Java Trench.

The Lesser Sunda Islands consist of two geologically distinct archipelagos. The northern archipelago, which includes Flores (left, center), Sumbawa (full image, west of Flores),  Lombok (full image, west of Sumbawa), Bali (full image, left edge) and Wetar, is volcanic in origin.

The islands of the southern archipelago, on the other hand, including Sumba (left edge, below center), Timor (right edge, center) and Babar, are non-volcanic.

Lying at the collision of two tectonic plates, the Lesser Sunda Islands comprise some of the most geologically complex and active regions in the world. Biodiversity and distribution is affected by various tectonic activities.

The Lesser Sunda Islands differ from the large islands of Java or Sumatra containing many small islands as well as deep oceanic trenches. Flora and fauna immigration between islands is restricted, leading to the evolution of a high rate of localized species.

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