It has been proposed to construct a canal from Lough Earne, beginning near Belturbet, and to follow along the valleys of the Finn and Blackwater to Lough Neagh.
The Fergus River, county Clare, is navigable from its mouth, in the Shannon, up to Ennis, the county town.
The Foyle River is navigable for 10 miles from its mouth, in the estuary of Lough Foyle, below Londonderry, up to Strabane.
The Lagan Navigation commences in the tideway at Belfast, and proceeds mostly by the course of the rivers as far as Lisburn, from which it is continued by a canal by Hillsborough and Moira to Lough Neagh. The total length is 28 miles.
The Lee River is navigable in the tideway up to the city of Cork, and for small craft somewhat farther. Below Cork, however, the navigation is principally an arm of the sea called Cork Harbour.
The Liffey River is navigable from its mouth in Dublin Bay for about 3 miles up to Carlisle Bridge, at the farther end of the city of Dublin. From the south side of this navigable part proceeds the Grand Canal, and from the north side the Royal Canal, of which we shall presently speak.
The Limerick Navigation commences at that city, and proceeds in a north-easterly direction, partly in the Shannon and partly by canals, for 15 miles, to Killaloe, at the south end of Lough Derg.
The Moig River, county Limerick, is navigable from its mouth in the Shannon to near Adare.
The Moy River, county Mayo, is navigable for about 5 miles, from Killala Bay up to Ballina.
The Neagh Lough, or Lake, being about 20 miles long and 10 broad, is generally of sufficient depth to be navigable to a considerable extent in every direction. It communicates with Belfast by the Lagan Navigation, with the Tyrone Collieries by the Blackwater, with Antrim by the Antrim river, and southward with the sea by the Newry Navigation.