Flimston Bay coastal promontory fort is a spectacular Iron Age site commanding a precipitous cliff-top position in south Pembrokeshire.
Part of the Castlemartin military training area, the carboniferous limestone of the southern cliffs is constantly eroding into contorted headlands, natural arches, and offshore stacks. The coastal fort even encloses a yawning chasm called ‘The Cauldron’. In 2014, a major cliff fall took away 5m of the promontory fort’s eastern ramparts.
Flimston is a baseline study site for the EU-funded Ireland–Wales CHERISH project (2017-2023), which is studying climate change and eroding coastal heritage in Ireland and Wales. Part of the project ethos is to create new, highly accurate baseline data for poorly mapped heritage sites, so that coastal erosion can be accurately monitored in the future.
