Rebun Island lies in the Sea of Japan off the northwestern tip of Hokkaido, Japan. Rebun stretches 29 kilometers in the north-south direction and 8 kilometers east-west, covering about 80 square kilometers. The island is known for its alpine flowers and the 8-Hour Hiking Course which runs from one end of the island to the other, north to south. The hiking course can be broken into two sections, known as the 4-Hour Hiking Courses. The island is part of the Rishiri-Rebun-Sarobetsu National Park.