Surtshellir, the longest lava cave in Iceland, is named after a fire giant from Norse mythology. Located in the Borgarfjordur district, this cave is steeped in folklore and was once a refuge for outlaws. Visitors can explore its innermost part, known as 'The Ice Cave', where they can marvel at ice formations and columns. With its haunting history and connections to ancient tales, Surtshellir offers a unique and mystical experience for those seeking adventure in Iceland's rugged landscape.