The Ijen volcano complex is a group of composite volcanoes located on the border between Banyuwangi Regency and Bondowoso Regency of East Java, Indonesia.It is inside an eponymous larger caldera Ijen, which is about 20 kilometres (12 mi) wide. The Gunung Merapi stratovolcano is the highest point of that complex. The name ‘Gunung Merapi’ means 'mountain of fire' in the Indonesian language; Mount Merapi in central Java and Marapi in Sumatra have the same etymology.

 West of Gunung Merapi is the Ijen volcano, which has a one-kilometre-wide (0.62 mi) turquoise-coloured acidic crater lake. Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones run east–west across the southern side of the caldera. The active crater at Kawah Ijen has a diameter of 722 metres (2,369 ft) and a surface area of 0.41 square kilometres (0.16 sq mi). It is 200 metres (660 ft) deep and has a volume of 36 cubic hectometres (29,000 acre⋅ft).

The lake is recognised as the largest highly acidic crater lake in the world. It is also a source for the river Banyupahit, resulting in highly acidic and metal-enriched river water which has a significant detrimental effect on the downstream river ecosystem. On July 14–15, 2008, explorer George Kourounis took a small rubber boat out onto the acid lake to measure its acidity. The pH of the water in the lake's edges was measured to be 0.5 and in the middle of the lake 0.13 due to a high concentration of sulfuric acid.

Tabuhan Island is located in the middle of the Bali Strait Sea and is included in the Banyuwangi Regency area. Precisely located in Bangsring Village, Wongsorejo District, Banyuwangi.

Tabuhan Island is an uninhabited island with a very beautiful beach view. The beach on this island has soft white sand complete with lush green trees. This island has an area of 5-6 hectares which offers a wide view of the blue sea, as well as snorkelling spots.

This island has a very clear view of sea water so that visitors can see the conditions under the sea clearly. There are also boat rentals on this island for rent to visitors who want to get around enjoying the beauty of the island from the sea. From this island, you can see the view of Ijen Crater and Mount Raung from afar.

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