It was named "Føhnfjord" owing to the powerful Foehn wind gusts blowing during the first exploration of the fjord in August 1891.

[2] Ryder wrote: ... Icebergs now came sailing out of the fjord in a strong current, and with very frequent calving perhaps because of the warm temperature.

Ten kilometers before the mouth, the fjord has a branch in the northeastern shore named Rensund that separates Danmark Island from Milne Land.

Fonfjord makes a sharp bend to the north near the western end with the Rode Fjord (Rødefjord) running in a north-northeasterly direction and the Vestfjord branching roughly to the southwest.

The Rolige Bræ glacier flows into the Rode Fjord just north of the Vestfjord junction..[4] This Greenland location article is a stub.