Although the natural wonder Stuðlagil and the basalt columns have always been here, much of this fascinating landscape was underwater until only a few years ago. It is almost hard to believe when standing here that this was a terrifying place under the forceful pressure of a dominating and angry river. It is by any standard one of the most beautiful places in Iceland where you can see and photograph exceptional basalt columns.
When Icelanders built the hydroelectric plant Kárahnjúkavirkjun the sources for the river Jökla were affected. Instead of running as a glacial river through the valley of Jökuldalur, its source in the north-eastern highlands was diverted into the Hálslón reservoir. From the reservoir, its flows with its former force through 60 kilometers of underground tunnels to drive the hydro-electric turbines of the power plant. So, most of the old sources of the river Jökulsá á Brú don't reach Jökuldalur anymore.