Mýrar, the district between the rivers Hornafjarðarfljót and Kolgríma, flat, wet, with many low rock–hills and extensive gravelbeds. The coast is characterised by long, wide sand–bars with mudflats and lagoons. Vatnajökull dominates the background with many glaciertongues in between high and majestic mountains. Glacial rivers, counting from the east: Hólmsá, Heinabergsvötn and Kolgríma, spread all over, continually changing their courses. The streams of Heinabergsvötn, for instance, were bridged in 1947 but the following year they changed their course and started running into Kolgríma, so the bridge has stood on dry land ever since. The glacier–tongues Fláajökull and Heinabergsjökull stretch far down into the district. It is possible to drive to Fláajökull along Hólmsá. Heinabergsjökull divides into two arms around the mountain Hafrafell, north of which there is another mountain, Snjófjall, with a peculiar glacier hollow on the south side. The valley Vatnsdalur (“Water (or lake) valley”) on the western side of Heinabergsjökull often collects large quantities of water dammed up by the glacier, Heinabergsvötn. Once in a while this water forces its way out under the glacier, causing big floods in the rivers. The low mountain Jökulfell (150m) in front of Fláajökull was hidden by ice at the beginning of the century, but began to come into view around 1920.