Carnedd y Filiast (Glyderau)

Mynydd Perfedd is a mountain in Snowdonia, Wales, forming part of the Glyderau. The summit has a shelter cairn, offering good views of Foel-goch's north-eastern face, and the Carneddau. Between it and Carnedd y Filiast, there are dramatic cliffs to the east, including the famous Llechen Cytrolar. To the south lies the parent peak Elidir Fawr, to the west Carnedd y Filiast and to the east Foel-goch and Y Garn. It is 812 metres (2,664 ft) high. The average annual temperature of the mountain is about 6 Celsius.

Marchlyn Mawr reservoir is a high level lake in Snowdonia behind Elidir Fawr mountain. It is used as the high level water source for Dinorwig power station, a closed-loop pumped storage hydroelectric generating facility. It is said that nearby lies the cave containing Arthur's treasure, a source of bedazzlement to the wanderer who sees it, and of disaster to the pilferer who touches it. The lake itself lies in between two mountains Carnedd y Fillast and Elidir Fawr and lies at a height of 636m above sea level and the reservoir took four years to build (from 1975 to 1979). The reservoir holds about 9.2 million cubic metres (320 million cubic feet) of water. From the reservoir, a 10.5-metre (34 ft) diameter tunnel runs for 1.7 km (1.1 miles) to a 10 m (33 ft) diameter vertical shaft. From the bottom of the shaft, a 9.45 m (31 ft) diameter tunnel leads to the power station, 670 metres (2,200 ft) away. It is possible to cycle up the road to the reservoir but a gate at the bottom prevents cars from driving on the road.

Foel-goch is a mountain in Snowdonia, north-west Wales, and forms part of the Glyderau range, in Gwynedd. It lies in between Y Garn and Mynydd Perfedd.Good views of Dyffryn Ogwen are seen with Pen yr Ole Wen, Carnedd Dafydd, Tryfan, Glyder Fawr and Elidir Fawr close by. Its height is 831 metres (2,726 ft).

Elidir Fawr is a mountain in Snowdonia, north Wales, the northernmost peak in the Glyderau. Its name means 'Big Elidir', named after a legendary warrior king of the 6th century also known as Eliffer Gosgorddfawr (Elidir of the Great Army).To the north of the summit is a small lake, Marchlyn Mawr, which is the upper reservoir for Dinorwig power station, a pump-storage power station hidden inside the mountain. Water from this lake flows through huge tunnels into the lower reservoir Llyn Peris. From the north, Elidir Fawr is very prominent, and can appear to be higher than the higher mountains behind it.

The Penrhyn quarry is a slate quarry located near Bethesda, North Wales. At the end of the nineteenth century it was the world's largest slate quarry; the main pit is nearly 1 mile (1.6 km) long and 1,200 feet (370 metres) deep, and it was worked by nearly 3,000 quarrymen. It has since been superseded in size by slate quarries in China, Spain and the USA. Penrhyn is still Britain's largest slate quarry but its workforce is now nearer 200.

For the river which flows into Bala Lake see Afon Llafar (Dee)Afon Llafar is a river in the Carneddau, Snowdonia. It rises where many streams flow down the slopes of Yr Elen, Carnedd Llewelyn and Carnedd Dafydd to join together in the valley below the cliffs of Ysgolion Duon ("Black Ladders"). It is one of several similarly named streams in Wales. The river flows north-west along Cwm Pen-llafar, with Caseg River joining it near Gerlan, and discharges into the River Ogwen in the heart of Bethesda. Afon Llafar has the same etymology as the River Laver in North Yorkshire, England, with both being derived from Brittonic laβar, meaning "talkative, boastful" (Welsh llafar, "loud, noisy").

Bethesda Athletic F.C. (; Welsh: [bɛθ'ɛsda]) is a football club based in the Welsh town of Bethesda, in northwest Wales. They play in the Ardal NW which is in the third tier of the Welsh football pyramid.

Y Garn is a mountain in Snowdonia, North Wales, part of the Glyderau. It is one of the Welsh 3000s — the 15 summits in Wales over 3,000 feet (914.4 metres) in height. It is the tenth-highest peak in Wales. Moderate snow accumulations can take place on the western-sloping side of the mountain from October to May. The south-westerly side of the mountain slopes gently down to the Nant Peris valley. The other, north-easterly side is of a different character, consisting of two steep-sided cwms, Cwm Clyd and Cwm Cywion, and finally Llyn Idwal and Ogwen Cottage. Along the ridge to the north lies Elidir Fawr, while to the south-east is the top of the Twll Du and Glyder Fawr.In 2011 three people were walking on Y Garn when they went over a cornice overhanging a ridge. About 50 metres of snow collapsed when the cornice gave way creating an avalanche and a person died when they fell 150 metres.

Bethesda (; Welsh: [bɛθ'ɛsda]) is a town and community in Gwynedd, Wales. It is on the banks of Afon Ogwen and on the edge of Snowdonia. It is 5 miles (8.0 km) from Bangor.

Felin Fawr Works is a former slate works to Penrhyn Quarry Railway in Bethesda, Wales. It dates back to 1803; This is when the first mill was supposedly built. Felin Fawr closed in September 1965 with its current owners being Felin Fawr Cyf. Most of the buildings, if not all of them, are listed.

Jerusalem Chapel, Bethesda, Gwynedd, Wales is a Presbyterian Church of Wales chapel built in 1841–1842 and reconstructed in 1872–1875. Of colossal size, the chapel can accommodate 980 people in its horseshoe amphitheatre. Still an active chapel, it is a Grade I listed building.

Cwm Caseg is a broad glacial valley in Snowdonia leading west from the Carneddau towards Bethesda. It is bordered by Carnedd Llewelyn to the southeast, Yr Elen to the west, and Foel Grach to the northeast. It contains a small lake, Ffynnon Caseg.