Grábrók is a volcanic crater located in West Iceland, near Lake Hreðavatn. Formed around 3,400 years ago, it's the largest of three craters in the area. A popular hiking spot, Grábrók offers scenic views over the university campus and moss-covered lava fields of Borgarfjörður. Accessible from the Ring Road, it's an easy trek suitable for all ages. Don't forget to check out the nearby roadside restaurant, Hreðavatnsskáli, for a bite to eat after your hike!