Moel Siabod is a Hewitt of 872.2 m in Conwy. No register hill in Conwy has a greater drop, though Tryfan is higher.
It is the most isolated register hill in Conwy: higher ground is 6.1 km away. Its nearest higher summit, Glyder Fach (994.3 m, 6.1 km north-west), is a listed top not profiled here. The summit is marked by a trig point.