Gellilydan

Ceunant Llennyrch National Nature Reserve is one of several woodland reserves in the Vale of Ffestiniog in Gwynedd, Wales and runs from Llyn Trawsfynydd to the River Dwyryd, near the village of Maentwrog. The reserve's broad expanse of woodland coats a steep-sided gorge, through which the Afon Prysor cascades. At one point, the river is flanked by one hundred feet (30 m) high cliffs, which face each other only 10 metres (33 feet) apart. The high humidity offered by the falls creates the perfect environment for numerous damp-loving plants, due to the high humidity and high rainfall, it is technically a temperate rainforest.

Maentwrog Road railway station was on the Great Western Railway's Bala Ffestiniog Line in Gwynedd, Wales.

Trawsfynydd nuclear power station (Welsh: Atomfa Trawsfynydd) is a former Magnox nuclear power station situated in Snowdonia National Park in Gwynedd, Wales. The plant, which became operational in 1965, was the only nuclear power station in the UK to be built inland, with cooling water that was taken from the artificial Llyn Trawsfynydd reservoir which also supplies the hydro-electric Maentwrog power station. It was closed in 1991. Its ongoing decommissioning by Magnox Ltd was expected to take almost 100 years, but in 2021 the Welsh government arranged for the power station to be redeveloped using small-scale reactors.

Ceunant Cynfal National Nature Reserve is a river gorge which forms part of a wet wooded ravine of the Afon Cynfal near Ffestiniog in Gwynedd, Wales. The reserve is administered by Natural Resources Wales

Dduallt railway station (English: Black hill) (pronounced [ˈðɨ.aɬt]) is a passenger station on the narrow gauge Ffestiniog Railway in northwest Wales, which was built in 1836 to carry dressed slate from Blaenau Ffestiniog to Porthmadog for export by sea. Dduallt is at a height of 540 feet (160 m) and a distance of just over 9.5 miles (15.3 km) from Porthmadog.

Trawsfynydd Lake Halt was a solely passenger railway station near the northeastern tip of Llyn Trawsfynydd, Gwynedd, Wales. Many Nineteenth and early Twentieth Century institutions in Wales were given anglicised names, this station being one. Over the years, and especially since the Second World War, most have been rendered into Welsh or given both Welsh and English names. Trawsfynydd Lake Halt closed before this happened.

Campbell's Platform (grid reference SH673418) is a private, unstaffed halt on the Welsh narrow gauge Ffestiniog Railway, which was built in 1836 to carry dressed slate from Blaenau Ffestiniog to Porthmadog for export by sea. It is 9 miles and 7 chains from Porthmadog and is at 510 feet above sea level.

Coed y Rhygen National Nature Reserve is located on the western shore of Llyn Trawsfynydd in Gwynedd, North Wales. As an example of Atlantic Rainforest, it is very wet and there are many different examples of mosses and liverworts that cover the ground and the trees. The reserve covers 2.78 hectares, is privately owned and is not open to the public.

Coed Cymerau National Nature Reserve is a wooded area of approximately 26 hectares on the north side of the Vale of Ffestiniog through which the River Goedol runs. There is one path that runs through the forest but the rest of the area is primarily native broadleaved woodland and thick undergrowth, adjacent to the nature reserve is Coed Cymerau Isaf which is owned by the Woodland Trust.

Maentwrog () is a village and community in the Welsh county of Merionethshire (now part of Gwynedd), lying in the Vale of Ffestiniog just below Blaenau Ffestiniog, within the Snowdonia National Park. The River Dwyryd runs alongside the village. Its population of 585 in 2001 increased to 631 at the 2011 Census. The Community of Maentwrog includes the village of Gellilydan.

Coedydd Maentwrog, on the north side of the Vale of Ffestiniog, is the largest wood in the Vale (which runs from the coast at Porthmadog inland to Blaenau Ffestiniog in Gwynedd). The national nature reserve consists of two separate sections: Coed Llyn Mair, and a group of three forests (Coed Ty Coch, Coed Bronturnor and Coed Glanrafon). It offers a variety of habitats, rising from the wooded valley onto open moorland and reaching towards the foot of Moelwyn Bach mountain. A nature trail and a network of public footpaths (some of which are steep and slippery when wet) are features of the reserve. Animals such as the rare lesser horseshoe bat and the wood warbler can be spotted here, and the gorge is noted for its liverworts and lichens. The reserve is located near Maentwrog, and is accessible by car via the A487. It may also be reached year-round by bus and by train from Easter to November, with occasional service during Christmastime and school holidays.

Saint Twrog's Church is in the village of Maentwrog in the Welsh county of Gwynedd, lying in the Vale of Ffestiniog, within the Snowdonia National Park. It is in the Deanery of Ardudwy. It is designated by Cadw as a Grade II listed building.A church was founded on the current site in the 6th century by Saint Twrog. It is believed that he was the son of Ithel Hael o Lydaw of Brittany. He was also the brother of Saint Tanwg of Llandanwg, Saint Tegai of Llandygai and Saint Baglan of Llanfaglan and Baglan.There are two other dedications to Saint Twrog: at Bodwrog in Anglesey and at Llandwrog. When Twrog first arrived in the village, the valley would have been very marshy, which provided him with the wattle that he would have needed to build his cell. Out the church near to the belfry door is a large stone known as Maen Twrog (maen being the Welsh for stone). Twrog is reputed to have thrown the stone from the top of Moelwyn crushing a pagan altar in the valley below; it is said that his handprints can still be seen in the stone. The parish of Maentwrog gets its name from this stoneThe yew trees in the churchyard are said to be over 1300 years old. They were a feature of the ancient pagan burial places, their evergreen leaves being a symbol of immortality; however, 1300 years ago the site would have been Christian not pagan. Another use of the yew trees was for military purposes as the yew timber was excellent for making bows, but because of the poisonous nature of the yew trees they were not popular among the people and were therefore grown in relative safety in places such as churchyards. The church that was on the site before 1896 was dedicated to Saint Mary, which has a connection to the Cistercian monks who were very numerous in the Maentwrog valley at one time. In the village there is also Saint Mary's well and across the valley is Llyn Mair (Saint Mary's Lake). In 1504, the church was described as a chapelry attached to the extensive parish of Ffestiniog. During the years 1572 to 1624, the notable Edmwnd Prys was rector of the church. He translated the metrical psalms into Welsh, and the present west window commemorates his work.The church was rebuilt in 1814 on the old foundations and was described as a neat stone edifice and was rectangular with a square embattled tower. There was no chancel at that time, the altar being placed in front of the present altar rails, with the door and porch being on the north side. On the west wall of the church there were three small windows. In 1896 a new chancel was built along with a baptistery and new stained glass windows were installed consisting of the east and west windows and the small "Good Shepherd" window. The vestry window "Son of Consolation" is in memory of William Edward Oakeley, benefactor of the parish, with whose help the church was restored in 1896, his wife Mary Oakeley executed the beautiful carvings. During this alteration, the bell was replaced by an eight tubular bells and the present organ was installed at the same time. The old bell was installed in the village school tower. The architect responsible for the alteration work to the church in 1896 was John Douglas who was also responsible for the design of the lych gate. There are some memorials on the north side of the church and on both sides of the altar which were transferred from the 1814 church, and there is a carving of Saint Twrog on the pulpit. A fragment of Edmwnd Prys' pulpit also remains. The parish register goes back to 1695. Outside in the graveyard are three Celtic Cross style memorials to members of the Oakeley family. There is also a very old attractive church entrance gate which opens on the main road in Maentwrog.