Fláajökull, a glacier tongue of Vatnajökull, is one of those places that get under your skin. If you venture beneath the glacier, there will be a massive body of ice looming above you, and you’ll have no choice but to trust nature that nothing will happen just then.
The easiest way to reach Fláajökull is on foot from the Haukafell area, or if you are adventurous, you can drive along the road by the Holmsá river, turning off at these coordinates: 64.28112, -15.47160.