Bwllfa Colliery was a coal mine, located in the Dare valley near Cwmdare in Rhondda Cynon Taf, South Wales.
Bwlchygroes (sometimes spelled Bwlch-y-groes) is a small upland rural village in the community and parish of Clydau, north Pembrokeshire, Wales, 5 miles (8 km) SW of Newcastle Emlyn and the same distance east of Crymych.
Bwlchgwyn is a village in Wrexham county borough, Wales, on the A525 road, 5 miles (8 km) west of the town of Wrexham and 10 miles (16 km) south-east of the town of Ruthin.
Bwlch y Ddwyallt is the name commonly applied to the high point of the plateau of Gwaun Cerrig Llwydion in the eastern part of the Brecon Beacons in south Wales.
Bwlch Mawr is a hill near the northeastern corner of the Llŷn Peninsula in the community of Clynnog in the county of Gwynedd in North Wales.
This is a list of the named geological faults affecting the rocks of Wales. See the main article on faults for a fuller treatment of fault types and nomenclature but in brief, the main types are normal faults, reverse faults, thrusts or thrust faults and strike-slip faults.