We now approach the famous Slieve League, the grandest, the boldest, the steepest, if not the highest, of all the cliff barriers on the coasts of these islands, and one of the most remarkable in the known world. It can be seen from the shore near Sligo, rising almost perpendicularly from the sea. The cliff-mountains of Achill, colossal as they are, seem to shun the full fury of the western gales, for they face the north-west; but Slieve League looks almost due south-west, and thrusts itself out into the ocean as if to court the most tremendous shock of the Atlantic's billows. It forms the culminating point of a range of cliffs that are over six miles in extent, extending from Carrigan Head to Teelin Head, the lowest cliff of which is over seven hundred feet in height. Slieve League is two thousand feet high, and almost perpendicular. It is two hundred feet lower than the highest of the cliff-mountains of Achill, but it is bolder, nearer being perpendicular, grander, and more rugged than they. Those who have not been on the sea at the base of Slieve League cannot form a true idea of its awful grandeur. Its summit is almost as sharp as a knife blade; and he who could look from the jagged rocks that form its cone down on to the seething ocean under him without feeling giddy should have a steady head and strong nerves. Those who go from these islands to Norway in search of the sublime should first see this king Irish cliff-mountains, and know how grand and beautiful are the sights that may be seen at home. The whole of the coast of Donegal is magnificent. There is no other cliff on it as high or as grand as Slieve League, but there are hundreds of places along its nearly a hundred miles of iron-bound, storm-beaten coast that are well worth seeing. It has nothing like Clew Bay, but it has gigantic cliffs, narrow arms of the sea, some of which are nearly as wild and as grand as the famous Killary Bay that has already been described. There may be certain places in the more southern coasts that are finer and fairer than anything on the coasts of Donegal with the exception of Slieve League, but for general wildness and cliff scenery there is hardly any sea-coast county in Ireland can equal it. It has the longest sea loch in the island on its coast--namely, Loch Swilly. Following its windings from its mouth to where it begins must be over five and twenty miles. It is a beautiful lake also, and hardly known at all to tourists, and never can be known until better means are supplied for seeing it from a steamer on its waters. The "wild west coast" may be said to end at the mouth of Loch Swilly. From there eastward it is the northern coast. There is much of the grand, beautiful, and curious to be seen on the northern coast from Inishowen to Fair Head, including the celebrated Giant's Causeway, and "high Dunluce's castle walls." The latter have been already described.