Gjabakki is an abandoned farmstead in the Thingvellir area, situated just east of the boundaries of the National Park near the tectonic fault lines on the westernmost edge of the Eurasian Plate. Two roads through the Icelandic Graben cross near the abandoned farmhouse, where a much frequented, secondary summer road continues across the Gjabakki moor land towards east. In connection with the great celebrations of the Millennium of Christianity in Iceland on the first and second of July 2000, the road was somewhat improved in 1999.
The highest elevation of the road offers fine panoramic views over the lake and a part of the rift valley or the so-called Icelandic Graben. Near that point is a small, cone shaped hornito, Tintron, created by the emission of steam during the eruption.

It is possible to climb by a rope down through its opening into a large lava cave below. Closer to the road, another cave, near the so-called Taglaflot, is to be found. This cave is about 400 m long.

During early winter, this area is very popular among the ptarmigan hunters. Later in winter, some of those who own or operate snow scooters for visitors start their adventure excursions into the mountains from there.