Sumatra is the largest island of Indonesia, located in the western part of the country. It is the sixth largest island in the world, with an area of 473, 481 km2. Sumatra is home to a wide variety of flora and fauna, including the endangered Sumatran tiger and orangutan. The island is also known for its volcanoes, hot springs, and geothermal energy sources. Sumatra is a popular tourist destination, offering a variety of activities such as trekking, rafting, and surfing.