Iceland’s tallest waterfall, is located in Botnsdalur valley, Hvalfjörður. Leading up to it is a fabulous hiking path that should only be attempted by those not daunted by heights or challenging hikes. Glymur is in the river Botnsá that runs out of Hvalvatn, which is a lake closed by molten lava, some 160 metres deep. In Hvalfjordur in West Iceland you can stand in awe before Iceland’s highest waterfall. Standing by the fall you'll have a good view of the surrounding landcape, which is is particularly attractive, as Hvalfjordur is widely considered one of Iceland's most beautiful fjords.The walk, approximately 4 hours roundtrip, will take you from the trailhead at Botnsa river through spectacular scenery including a rock arch and will have you crossing a crystal clear river on a strategically placed log.