Malltraeth Marsh

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.

The Anglesey Coalfield is a minor British coalfield. Although it is situated in north-west Wales, this isolated coalfield on Anglesey is not usually considered to form a part of the North Wales Coalfield which lies in Flintshire and Denbighshire in north-east Wales although both measures were formed during the Carboniferous period. Stretching from Nant and Hirdrefaig in the Pentre Berw area along Cors Ddyga ("Tygai's marsh") and under the sea at Malltraeth village which was called 'yr Iard' or 'Iard Malltraeth'. On the western side of the Afon Cefni lies Cors Malltraeth. It was named after Cwmwd Malltraeth (Commote) which was the old Welsh way of dividing the Isle of Mona by the Welsh Princes and the Church. Both coalfields measure around 9 miles long.Working the coal on Cors Ddyga at such places as Nant, Tyddyn Mawr, Penrhyn Mawr, Gwaith Berw (New Berw Mine), Berw Uchaf and Tai Hirion took place during the coalfield's 300 year productive life from the fifteenth to the late nineteenth century. The work on and above Cors Malltraeth below Llangristiolus, Paradwys, Trefdraeth and under the bay at Malltraeth village progressed throughout the nineteenth century. During the early years of the twentieth century a committee was formed to reopen the coalfield at Llangristiolus but the middle class and farming gentry did not support the venture.

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.

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.

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

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.

Cerrigceinwen (Welsh: ['kɛrɪɡ'kɛinʊɛn]) is a hamlet in the community of Llangristiolus, Anglesey, Wales.

Paradwys is a village in Anglesey, in north-west Wales.

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.

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.

Henblas is an area in the community of Llangristiolus, Anglesey, Wales, which is 130.7 miles (210.3 km) from Cardiff and 214.6 miles (345.3 km) from London.