[2] The 594 feet (181 m) rocky hill stands in a prominent and isolated position dominating Whitesands Bay.

[5] Prehistoric enclosures and field systems are located to the northwest of the hill,[6] near to an iron-age defensive wall.

[7] During World War II, a Chain Home Low early-warning radar station was located on Carn Llidi.

[8] Also during World War II, on 4 June 1943, a Martin B-26 Marauder medium bomber of the 335th Bombardment Group of the US Air Force crashed into Carn Llidi killing all four crew, after it had become lost in poor weather on a flight from North Africa to Cornwall.

[10] The walk which leads from a Whitesands Bay car park can take you to the summit either through Porthmawr Farm or via the coast path towards St Davids Head.