For the longest time the Glymur waterfall with a cascade of 198 m, was the tallest waterfall in Iceland. Then in 2011 it was surpassed by a new waterfall by Morsárjökull glacier due to an eruption. Glymur is part of the river Botnsá in Hvalfjörður and falls alongside the Hvalfell mountain into a steep canyon. The waterfall is accessible from a parking area by the road. For the best view, it is quite pleasant to hike to the top of the waterfall along marked trails.
You can only observe the waterfall from the east side. The trail begins by passing through a gate and a short walk along a road marked by yellow-painted rocks. A few hundred meters along the road, the trail drops over a small cliff face and descends through a cave down to the river. During summer, a small wooden pole is laid across the river with and adjacent cable for a handhold, where hikers can cross to the eastern side. Here the trail climbs steeply through muddy, rocky and loose gravel areas and at times it skirts steep drop-offs. In 1-2 km, you will reach the area most ideal for viewing the waterfall. You can, of course, hike further upwards to fully enjoy the spectacular view of the Hvalfjörður fjord, its unusual flora and fauna and, of course, the majestic mountains.