Gili Trawangan is the largest of Lombok's Gili Islands and the only one to rise significantly (30 m) above sea level. Measuring 3 km long and 2 km wide, it has a population of around 1500 (see demography). The name Trawangan originates from the Indonesian word Terowongan (Tunnel) due to the presence of a cave tunnel built there during Japanese occupation in World War 2. Japanese presence during the second world war was on elevated topography in the South of the island, where anti-aircraft guns were housed. Only the base of the AA guns remains at the end of the tunnel. Of the Gilis, Trawangan is the most developed and geared towards tourism. The main concentration of settlement, recreation, accommodation and diving business is situated on the eastern side of the island. A local pub, Tír na Nóg claims that Trawangan is the smallest island in the world with an Irish pub. It was previously administered under Lombok Barat Regency along with Senggigi until 2010 when the Gili islands came under the jurisdiction of the new North Lombok Regency (Kabupaten Lombok Utara).