The municipality has high and steep mountain ranges as it is located at the foot of Romblon's tallest peak, Mount Guiting-Guiting. Other mountains are Mount Sibuyan and Mount Conico. Much of its territory is part of Mount Guiting-Guiting Natural Park made up of lush tropical rainforest where unique flora and fauna thrive, giving Sibuyan the nickname, The Galapagos of the Philippines.