About the location
Pollnagollum sits within the Cuilcagh Lakelands UNESCO Global Geopark on Belmore Mountain, the second highest point in Fermanagh at around 398m. The cave entrance is fed by a waterfall dropping a 12-metre limestone cliff, and the system behind it is reckoned to be the longest cave in Ireland, stretching over many kilometres underground.
Game of Thrones filmed across Northern Ireland for the best part of a decade, and this corner of Fermanagh provided the cave mouth used as the Hollow Hill in Season 3 (2013). What you see on the ground is simply the real place — a forest, a cliff and a waterfall — which is exactly what made it work on screen.