Anglesey Coalfield

Malltraeth Marsh (also spelled as Malldraeth; Welsh: Cors Malltraeth or Cors Ddyga) is a large marsh area in Anglesey, North Wales, north-east of Malltraeth village, along the flatlands of Trefdraeth, Bodorgan, Llangristiolus and south of Cefn Cwmwd, Rhostrehwfa. It was reclaimed from estuarine marshes after the construction of the Malltraeth Cob (dyke), a 1 mile (1.6 km) long embankment, and the subsequent canalisation in 1824 of the Afon Cefni.The name Malltraeth comes from mall ('bad'), and traeth ('sandy shore'). The marsh measures 1,366.5 hectares (3,377 acres) in area. The area is recognised as a Site of Special Scientific Interest (SSSI), and has a range of reedbeds, marshes, wet grassland and small pools/lakes.

The Berw Fault is a SW-NE trending fault in North Wales. It forms part of the Menai Strait Fault System, with the Dinorwic Fault and the Aber Dinlle Fault. It has a long history of movement with early ductile fabrics preserved from a sinistral (left lateral) strike-slip sense shear zone active at the end of the Precambrian and into the early Cambrian. Any Caledonian deformation is unclear but the fault zone was reactivated in the Carboniferous as a NW-throwing normal fault with seismic reflection data showing the formation of a half-graben in its hanging wall. There are no indications of inversion during the Variscan Orogeny, but the fault was reactivated in a normal sense during the Permian and Triassic and again during the Cenozoic with a sinistral strike-slip sense.

St Cristiolus's Church, Llangristiolus is a medieval church near the village of Llangristiolus, in Anglesey, north Wales. The village, about 1 mile (1.6 km) from the building, takes its name from the church. Reputedly founded by St Cristiolus in 610, the present building dates from the 12th and 13th centuries. Alterations were made in the 16th century, when the large east window in Perpendicular style was added to the chancel – a window which has been described by one guide to the buildings of north Wales as "almost too big to fit" in the wall. Some restoration work took place in the mid-19th century, when further windows were added and the chancel largely rebuilt. The church is still in use for weekly Sunday services (in Welsh and English), as part of the Church in Wales, and is one of four churches in a combined parish. It is a Grade II* listed building, a national designation given to "particularly important buildings of more than special interest", in particular because of its age and the east window. The church contains a decorated font from the 12th century, as well as memorials from the 18th, 19th and 20th centuries. Richard Owen, a 19th-century Calvinistic Methodist minister from Llangristiolus, is buried in the graveyard. The churchyard also contains the grave of the noted geologists, Edward and Annie Greenly, who pioneered modern geological mapping in Anglesey.

St Caffo's Church, Llangaffo is a 19th-century church, in the south of Anglesey, north Wales, about 5 miles (8.0 km) from the county town, Llangefni. It was constructed in 1846 to replace the previous medieval church in the village of Llangaffo. The new building includes a number of monuments from the old church, and has a spire which is a prominent local landmark. The churchyard has part of a stone cross dating from the 9th or 10th century, and some gravestones from the 9th to 11th centuries. It is dedicated to St Caffo, a 6th-century martyr who was killed in the vicinity. The church is still in use as part of the Church in Wales, one of four churches in a combined parish. It is a Grade II listed building, a designation given to "buildings of special interest, which warrant every effort being made to preserve them", in particular because it is regarded as "a mid 19th-century rural church, consistently articulated and detailed in an Early English style".

Llangaffo is a village in Anglesey, in north-west Wales. It lies along the B4419 and B4421 roads, north of Dwyran, south of Gaerwen and northwest of Llanidan. It is named after Caffo, a 6th-century saint. A church, St Caffo's Church, is named after him. A war memorial, a village hall and a primary school are also located in the village. The 1851 census recorded 138 people in the village, 75 males, 63 females and a parish area of 1,590 acres (640 ha). It is in the community of Rhosyr. The 2011 census recorded a population of 357.

Lledwigan is a village in the community of Llangristiolus, Anglesey, Wales, which is 130.8 miles (210.6 km) from Cardiff and 213.4 miles (343.4 km) from London.

Llangristiolus is a village and community in the middle of Anglesey, Wales, southwest of Llangefni, and is named after Saint Cristiolus. The River Cefni flows through the village. The village is within a mile of the A5 and A55 roads. The village of Rhostrehwfa is in the community. The church of St Cristiolus, Llangristiolus, dates from the 12th century.

Holland Arms railway station was situated on the Anglesey Central Railway line from Gaerwen to Amlwch. Located in the village of Pentre Berw it was known as Holland Arms because of the well known hotel of the same name in the village. It also served as the junction of the Red Wharf Bay branch line from 1908 onwards.The original platform was on the Down (west) side of the track and had a wooden building containing a waiting room and ticket office on it. This was replaced by a stone building in 1882. There was also a small goods yard on the down side, just north of the platform. In 1908 to serve the new branch line a second platform with stone building was erected on the Up side (east). When the Red Wharf Bay branch closed to all traffic in 1950, there was little traffic at Holland Arms, and the station closed in 1952, the first on the Anglesey Central line to do so. Only one platform survives and the station building survives too. The single track goes past the station, towards Gaerwen, one way, and Amlwch the other way.

Henblas Burial Chamber is a Neolithic dolmen located in Henblas, to the southwest of Llangristiolus, Anglesey, Wales.

Rhostrehwfa is a village in southern-central Anglesey, located southwest of Llangefni. To the southeast is the Malltraeth Marsh. It is situated at a prominent point on the crest of a ridge overlooking the River Cefni valley to the south. It contains the Capel Pisgah and several holiday cottages. It is in the community of Llangristiolus and the Bodffordd electoral ward.

Bodowyr Burial Chamber is a Neolithic burial chamber made of a few large stacked stones (also known as a dolmen or a passage grave) in a farmer's field on the north Wales island of Anglesey. It is located at Bodowyr Farm, 1.25 mi (2.0 km) east of Llangaffo, off the B4419 road.

Pentre Berw () is a small village located on the island of Anglesey in north Wales. It lies about 2 miles (3.2 km) south of the county town of Llangefni, and next to Gaerwen.