Mynydd Cilan is located on the southern coast of the Llŷn Peninsula, with a summit rising to 117 metres. This area not only provides inspiring seaward views but also supports a range of habitats including heathland, maritime grassland and cliff habitats. Neighbouring lands comprise relatively unimproved permanent pasture while the headland itself remains easily and enjoyably explored through a combination of open access and public footpaths.
Heather and Western Gorse dominate the heathland, with small pockets of Gorse, Bilberry and Cross-leaved Heath in wetter areas. The heath and its associated pools contain noteworthy plants including Chamomile, Pale Dog-violet and Pillwort. The cliffs sustain Dotted Sedge, Portland Spurge and Ivy Broomrape.
This area is significant for Chough, with the sea cliffs and caves used for breeding, while the cliffs, heath, maritime grassland and pasture provide feeding sites throughout the year. An auk colony of Razorbill and Guillemot are situated along the western flank. Other notable breeding birds found include Shag, Cormorant, Kittiwake, Fulmar and Rock Pipit. Bordering heath and farmland support breeding Meadow Pipit, Linnet, Stonechat and Wheatear (summer visitor). Common and Bottle-nosed Dolphins are frequently observed offshore (best in summer).
At Mynydd Cilan, Plantlife has formed a close partnership with Gwynedd Council, the Countryside Council for Wales and local people to restore the network of overgrown pools and ponds. In response to this work, Three-lobed Water-crowfoot has increased considerably to a population of around 200 at sites across the common. Other species, such as Pillwort and Chamomile, are also growing as a result of better management.
There is limited local parking.