Naul (Irish: An Aill, meaning 'The Cliff', also known as "The Naul"), is a village, townland, and civil parish at the northern edge of Fingal and the traditional County Dublin in Ireland. The Delvin River to the north of the village marks the county boundary with County Meath. Naul civil parish is in the historic barony of Balrothery West.

Location and geography
The village sits on the crossroad of the R122 and R108 regional roads, the latter being the traditional route between Dublin and the port of Drogheda, while the R122 travels from Finglas in the south to Balbriggan.: 2 

The River Delvin passes through Naul at the north, through a deep valley known as 'The Roche' which is hemmed in by steep banks and rocky cliffs which rise to 20 metres at one point. In the valley, there is a natural waterfall known as 'Waterfall of The Roches'. Further downstream the river has been dammed, forming an artificial pond and cascade with a small private hydroelectric plant.: 2 

Naul village and the surrounding townlands which comprise the area of Naul, sit on the Northern border of County Dublin and Fingal. However, the area locally known as Naul also extends north of the county border into county Meath. The area of north county Dublin comprises 2,627 acres and includes 15 townlands: Naul (An Aill), Hazardstown (Baile an Hasardaigh), Reynoldstown (Baile Raghnaill), Coolfores (An Chúil Fhuar), Doolagh (Dúlach), Fortyacres (Daichead Acra), Winnings (Uininn), Hynestown (Baile Héin), Cabin Hill (Cnoc an Chábáin), Flacketstown (Baile Fhlaicéid), Lecklinstown (Baile Leithghlinne) and Westown (An Baile Thiar).
Given a reference text about Naul, tell me what country it's in and what river passes through it.
Naul is located in Ireland and the River Delvin passes through it.