rinjani4dRinjani on the island of Lombok rises to 3726 m, second in heht among Indonesian es only to Sumatra's Kerinci . Rinjani has a steepThen you get to do one of the most popular and challenging treks in Indonesia. Towering at 12,224 feet on the island of Lombok, Mount Rinjani is one of the hhest volcanoes in Indonesia.