Carnedd Llewelyn is a 3,000 ft mountain of 1,061.8 m in Conwy, Gwynedd. It is the highest of the 4 register hills recorded in Conwy, Gwynedd; the next is Glyder Fawr at 1,000.9 m, 60.9 m lower.
Only one of the register's Wales hills is higher. It is the 2nd highest Hewitt. It counts towards four lists: Hewitts, Nuttalls, Furths and Marilyns. Its drop of 747.5 m is 70% of its height: the col linking it to higher ground is only 314.3 m above sea level. It overtops all four of its nearest neighbours; the tallest of them, Y Garn (Gwynedd, SH630595), reaches 946 m. It stands 263.2 m above its nearest neighbour, Pen Llithrig y Wrach, 3.9 km to the south-east. All four of its nearest neighbours lie to the south, so it stands at the northern edge of its group. Its nearest higher summit, Crib y Ddysgl (1,065.3 m, 11.7 km south-west), is a listed top not profiled here.
