[3] Despite its location, just some 5 km from the high temperature area of Seltún, the volcano and its counterparts, the crater rows, fissures, as well as the tuya Geitahlíð (385 m[1]) with the crater Æsubúðir [ˈaiːsʏˌpuːðɪr̥] on its top,[2] are not part of the Krýsuvík volcanic system, but of the volcanic system of Brennisteinsfjöll as its southernmost outpost.

[1] Stóra-Eldborg undir Geitahlíð is a pyroclastic cone,[1] built up mostly from spatter and scoria it forms part of a crater row.

[6] The pyroclastic cones bear their name, because they are located very near to the tuya Geitahlíð (386 m), and one of the fissures even can be seen dissecting the side of the older volcano.

A Holocene crater is located up on summit plateau of the tuya which produced the lava field Krýsuvíkurhraun.

One wanted to cast a spell so that all the fish in a nearby lake would be hairy, and the other intended to bring up a storm and let all fishermen die, however, this did not happen.