Foel-fras is located at the northern end of the main ridge of the Carneddau, between Drum to the north and Foel Grach to the south, with the subsidiary summit of Garnedd Uchaf (926 m) between it and Foel Grach. Due south and 400 m below lies the reservoir of Llyn Dulyn, while the smaller reservoir of Llyn Anafon lies to the north.