From my book Nant Gwrtheyrn - Y Swyngyfaredd (The Enchantment)
This is the impressive Iron Age hill-fort of Tre’r Ceiri, looking towards neighbouring Yr Eifl and on towards Nefyn and the Llyn. The hillside is very exposed and it’s hard to imagine why people would settle this side of the hill! It would certainly get more sunlight, but would also face the prevailing winds and rain. However, its sheer size (approximately 150 huts) and condition impressed me greatly.