Waun-oer

Cribin Fawr is a mountain in Snowdonia, North Wales, situated approximately four miles to the south-west of Aran Fawddwy. It is one of the peaks in the Dyfi hills, a subgroup of the Cadair Idris group. It is a top of Maesglase, connected to its parent peak by the Craig Portas ridge. The top of Cribin Fawr is a large open plateau of peat bog. To the west is Waun-oer, to the north Cadair Idris, to the south Maesglase and Glasgwm to the east.

Mynydd Dolgoed or Craig Portas is a mountain in southern Snowdonia, Wales. It is a long ridge running from a low summit between the valleys of the Afon Angell and the Nant Ceiswyn, north east to the cliff of Craig Portas above Dinas Mawddwy. The next mountain in the ridge to south-east is Mynydd Hendre-ddu, while to the south lie Mynydd Llwydiarth and Mynydd Cymerau. It is one of the Dyfi hills.

Mynydd Llwydiarth is a mountain in southern Snowdonia, Wales. It is a long ridge running from a low summit to the south of Mynydd Dolgoed, running south-west to Mynydd Cymerau. Nant Llwydiarth rises on the south flank of the mountain, and on the west slope the Ratgoed slate quarry operated until 1946.It is one of the Dyfi hills.

Mynydd Ceiswyn is a mountain in Wales. It is the peak south of Waun-oer in the Dyfi Hills. On the east side of the mountain is the valley of the Nant Ceiswyn, and Cwm Hengae lies to the south. Two minor dip faults cross the mountain, and the Ceiswyn Formation is named after this mountain.

Ratgoed quarry (also known as Alltgoed quarry) was the northernmost of the slate quarries served by the Corris Railway. It is one mile north of Aberllefenni in Gwynedd, Mid Wales, on the western side of Mynydd Llwydiarth. The quarry primarily worked the Narrow Vein, though it also produced some Broad Vein slates.

Yellow Aster Mine was a large gold mine in Southern California.

Hendreddu quarry was a slate quarry about three miles west of Aberangell in Merioneth (now Gwynedd), North Wales, near Nant Hendreddu on the slopes of Mynydd Hendre-ddu. The quarry worked the Narrow Vein, the highest-quality slate vein in the Abercorris Group. For the majority of the quarry's existence, the Hendre Ddu Tramway was owned by the same company that owned the quarry, and the two were run as a single enterprise.

Mynydd Hendre-ddu or Mynydd Hendreddu is a mountain in southern Snowdonia, Wales. It is one of a line of mountains running from Mynydd Dolgoed in the north, through Mynydd Llwydiarth to Mynydd Hendre-ddu and on to Mynydd y Foel, Y Grug, Mynydd Tri-Arglwyd and Mynydd Gwyn to the south of the village of Aberangell. It forms the watershed between Nant Llwydiarth, which flows to the south-west and into the Afon Dulas, and streams flowing into Afon Angell to the north, which flow east into the River Dyfi. The summit is notable for a set of parallel ridges about 80 centimetres (31 in) across and 130 metres (430 ft) long that run across it.On the northern slope of the mountain lay the Hendreddu quarry which was connected to Aberangell by the Hendre-Ddu Tramway. Mynydd Hendre-ddu is one of the Dyfi hills.

Cymerau quarry was a slate quarry served by the Ratgoed Tramway, a horse-worked section of the Corris Railway. It is located about half a mile north of Aberllefenni in Merioneth (now Gwynedd), North Wales, on the eastern side of the isolated Cwm Ceiswyn. It worked the Narrow Vein, the highest-quality slate vein in the Abercorris Group.

The Nant Ceiswyn (sometimes known as the Afon Ceiswyn) is a small river in Mid Wales. It flows from the northern flank of Mynydd Dolgoed down to Pont Cymerau, north-east of Aberllefenni. Here it joins the Nant Llwydiarth to form the Afon Dulas that flows south to the Afon Dyfi. There was an ancient bridge at Pont Cymerau.The valley of the river is often known as Cwm Ratgoed (or Ralltgoed), after the Ratgoed slate quarry about two miles north of Pont Cymerau. The quarry was connected to the Corris Railway at Aberllefenni by the horse-worked Ratgoed Tramway, which crossed the river as it passes Cymerau Quarry.To the east of the valley is Mynydd Ceiswyn, part of the chain of ridges running southwards from Maesglase.

The Nant Llwydiarth is a small river in Mid Wales. It flows from the southern flank of Mynydd Hendre-ddu down to Pont Cymerau, north-east of Aberllefenni. Here it joins the Nant Ceiswyn to form the Afon Dulas that flows south to the Afon Dyfi. There was an ancient bridge at Pont Cymerau.

Mynydd Cambergi or Mynydd Cam-bergi is a mountain in southern Snowdonia, Wales. It is a summit on a long ridge between Mynydd y Waun to the north and Foel Grochan to the east. The mountain forms the north-east side of Cwm Hengae and sits about 0.5 miles (0.80 km) west of the village of Aberangell. Near the summit of the mountain lies the open pit of Cambergi quarry, which was worked from the 1870s to the 1890s.