Cavan (; ) is the county seat of County Cavan in Ireland. It is one of the three counties, the others being Monaghan and Donegal, which are part of the Irish province of Ulster but are part of the Republic. The town lies in the northeast of the island, along the border with Northern Ireland. The town is located on the main road - the N3 road - linking Dublin (to the south) with Enniskillen, Ballyshannon and Donegal Town (to the north). History The O'Reilly family (still a very common surname… (More on Cavan)