IIArvon and adjoining outbuildings to the north Situated in a prominent position at the junction of Heol Buddog and Ffordd-y-Sir with gardens in front and the similarly detailed Bod Owen alongside, the highly patterned slate roofs of Arvon and its
IIBarn and stables at Eithinog-uchaf Located at an oblique angle on the north side of the farmyard at Eithinog-uchaf; the farmyard sits to the north of the farmhouse on the track to Pant Eithinog, which itself lies just off Ffordd Clynno
IIBarracks Building Located to the south-west of the quarry offices on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.
IIBethel Chapel, railed enclosure and gates Prominently situated on slightly rising ground, into which it is set, towards the northern end of Penygroes, its Sunday School on the other side of the road, the chapel sits in its own walled and rail
IIBod Owen Situated in a prominent position at the junction of Ffordd-y-Sir and Heol Buddog with gardens in front and the similarly detailed Arvon alongside, the highly decorated slate roof of the building forms
IIBryn Deulyn Located on bend in narrow road at eastern entrance to Dorothea Slate Quarry with hooped iron railings on low entrance walls swept to left side to enable easy vehicular access.
IIBryn Eglwys Located in the village of Llanllyfni on the south-east side of Ffordd Rhedyw (Rhedyw Road) directly opposite the Church of St Rhedyw.
IIBryn-mawr Situated in small pasture fields overlooking sea on rough track approximately 300m west of Pant Eithinog.
IIBrynarvon Situated on track (Weirglodd-newydd) immediately above Talysarn.
IIBryngwdion Located in pasture fields at the end of a farm track running off the east side of the minor road, which turns off the A 499 towards Pont-y-cim; the farmhouse sits to the west of its farmyard.
IIBwthyn Located on the south side of the B 4418 at the foot of a rock face directly opposite the Chapel.
IICae-efa-lwyd-fawr Located at the end of a farm track off the north side of Ffordd Clynnog (Clynnog Road) about 1km west of Penygroes.
IICapel Drws-y-coed and Ty Capel Set in an isolated position at the foot of Craig y Bera on the north side of the B 4418, fronted by spear-headed iron railings and central gate on a low rubblestone wall with piers to the gates and en
IICauseway Located off the B 4418 to the north of Dorothea House, beginning beyond Pont Wythdir and running north-east for approximately 100m across marshy ground with a spoil heap to the north-west on the south
II*Church of St Rhedyw Prominently sited on a corner on Ffordd Rhedyw within a raised rubble-walled churchyard on sloping ground down towards the Afon Lyfni.
IICowhouse at Eithinog-uchaf Located on the east side of the farmyard at Eithinog-uchaf; the farmyard sits to the north of the farmhouse on the track to Pant Eithinog, which itself lies just off Ffordd Clynnog.
IISeion Congregational Church Situated in an elevated position amidst terraced housing approximately half way up Cavour Street; in front of the chapel is a small forecourt behind an irregularly coursed rubblestone wall, topped by
IISlab Mill Directly adjoins the large slate mill on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.
IISlate Mill Directly adjoining the slab mill to the south on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.
IIStore Building Located between the former slate mill to the north-east and the quarry offices to the south-west on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.
IIStrainer arches and retaining walls Located to the south of Pen-y-bryn, the strainer arches and walls retain the slate waste tips flanking the route of the Dorothea Quarry branch of the former Nantlle Railway.
IIWinding Drumhouse Located to the south-east of the slate mill on Level IV of Pen-yr-Orsedd Slate Quarry above the remains of the incline leading down to the start of the former Nantlle Railway below.
IIWinding Drumhouse and Incline Located to the south-east of the slate mill on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry, the drumhouse is dramatically sited at the head of the incline running downhill to the south-east
IIWinding house Located on Level VIII (Bonc Brig) of Pen-yr-Orsedd Slate Quarry to the east of the Eureka Slate Mill.
IIWorkshops Located to the south of the slate mill on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.
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