This is another of the great lakes of Ireland. It is over twenty miles long and between two and three miles in average breadth. It is really curious that a small island like Ireland should have so many immense lakes in it. There is, probably, no other country in the world of the same size--there is certainly no island of the same size--on which so much fresh water is to be found. It would seem as if nature intended Ireland for a continent, and not for an island, by giving it lakes so entirely disproportioned to its size. Loch Derg, anciently called Deirgdheirc, and at present pronounced Dharrig by the peasantry, would be the most beautiful of all the great lakes of Ireland if its islands were as numerous as those of Loch Erne, or even of Loch Ree. It has the defect that almost all lakes have whose shores are mountainous or hilly. Want of islands is the great drawback to the picturesqueness of most of the Scotch lakes and those of the north of England. A few islands do not add much to the beauty of a lake. There must be plenty of them to produce full effect. The few islands in Loch Lomond, because they are so few, hardly add to its beauty. The islands in Loch Derg are very few, and the most picturesque of them are so near the shore that they seem part of it to the voyager on the lake. There is one very large island, Illaunmore--the great island, as its name signifies--but it does not add very much to the scenic attractions. The charms of Loch Derg are its semi-mountainous shores. It would be incorrect to call the bold hills on either side of the lake mountains, for very few of them reach an altitude of more than a thousand feet; but they are most graceful in their outlines, and are, for the most part, covered with luxuriant grass up to their very summits. The lake is by no means straight; its shores are tortuous and full of indentations, so that there is a good deal of change of scene when sailing on it. But if the tourist or traveller who wishes to sail on Loch Derg is not what is usually called a "good sailor," he should consult the barometer before he goes on to this great lake, for sometimes, when the south-west wind sweeps up its twenty or twenty-five miles of water, a sea almost worthy of the Channel will sometimes rise in a very short time. Many a sea-sick passenger used to be seen in the good times long ago on Loch Derg, when large side-wheel passenger boats used to run regularly between Athlone and Killaloe. Those boats were large enough to carry over a hundred passengers without being in the least crowded, and the cabins were large enough to accommodate fifty people at dinner. A trip from Athlone to Killaloe on a fast boat would, on a fine summer day, be one of the most enjoyable things in the way of an excursion by water that can be imagined. It is over thirty years since the writer experienced the pleasure of it, and the remembrance of its enjoyableness haunts him still. The shores of Loch Derg are much