The Dyngjuhals fissure system has not yet been properly researched, but is considered to be about 10 km wide and 25-50 km long comprising the shield volcano Trolladyngja and even extending to the Dyngjufjoll Massif.  It continues to the south under the western part of the Dyngjujokull glacier tongue in the direction of the ice covered Bardarbunga central volcano.
Close to eight volcanic fissures, 5-10 km long, with SW-NE directions are side-by-side on the Dyngjuhals Ridge, each dotted with rows of scoria craters of different sizes.  Those fissure eruptions have created lava fields along the southern part of River Skjalfandafljot.  The limited research of the area suggests volcanic activity during Holocene and historical times.
The Kattarbudir Crater on the picture above was erased during a recent advance of the glacier snout Dyngjujokull and does not exist any more.
Picture: Kattarbudir Crater (vanished).