— Elfarch, 23–9, [650].

— y Fan Fach, 19, 256, [428], [429], [440], [444], [445], [582], [650].

— Fanod, [577], [578].

— Farch, [577], [578].

— Ferwyn, [577].

— y Ffynhonnau, 111.

— Ffynnon y Gwas, 31.

— Ffynnon Las, 134: see Glaslyn.

— y Forwyn, 23–6, [582].

— y Gader, 90–2.