Plogonnec is a commune and small town in the Finistère department of Brittany in north-western France. It is about 13 km (8 mi) north west of Quimper and 10 km (6 mi) east of Douarnenez. The town is twinned with Llandysul in Wales.

Llandysul, also spelt Llandyssul, is a small town and community in the county of Ceredigion, Wales. As a community it consists of the townships of Capel Dewi, Horeb, Pontsian, Pren-gwyn, Tregroes, Rhydowen and the town of Llandysul itself. Llandysul lies in south Ceredigion in the valley of the River Teifi and is visited for its fishing and canoeing. The community had a population of 2732, as of 2011. The village itself has a population of 1484.