The nation of Indonesia is almost unimaginably vast: More than 17,000 islands providing 108,000 kilometers of beaches. The distance between Aceh in the West and Papua in the East is more than 4,000 kilometers (2500 miles), comparable to the distance between New York City and San Francisco. Laying on the western rim of the Ring of Fire Indonesia has more than 400 volcanoes, of which 130 are considered active, as well as many undersea volcanoes. The island of New Guinea (on which the Indonesian province of Papua is located) is the second largest island in the world. Provinces are usually grouped by around larger islands and include smaller surrounding islands. The listing below follows this practice: Sumatra (incl. the Riau Islands and Bangka-Belitung) Wild and rugged, the 6th largest island in the world has a great natural and cultural wealth with more than 40 million inhabintants. Kalimantan (Borneo) The vast majority of this, the world's third largest island is covered by the Indo