Rhobell Fawr is a Hewitt of 734 m in Gwynedd. Its closest neighbour in this register, Glasgwm, is 8.0 km away.
It shares its height of 734 m with Craig Cwm Silyn, Fan Fawr and Long Side. On the Hewitts height ladder it sits between Harrison Stickle (735.3 m) and Craig Cwm Silyn (734 m). The summit is marked by a trig point.