Tradition has it that St. Patrick had prevailed on God to place the entrance to purgatory in Ireland, that the unbelievers might the more readily be convinced of the immortality of the soul and of the sufferings that awaited the wicked after death. A few monks, according to Boate, an old Irish writer, dwelt near the cavern that formed the entrance. “Whoever came to the island with the intention of descending into the cavern and examining its wonders had to prepare himself by long vigils, fasts, and prayers, to strengthen him, as we are told, for his dangerous expedition; but, in reality, by reducing his bodily strength to make his imagination more ready to receive the impressions which it was thought desirable to leave upon his mind. He was then let down into the cavern, whence, after an interval of several hours, he was drawn up again half-dead, and, when he recovered his senses, mingling the wild dreams of his own imagination with what the monks told him, he seldom failed to tell the most marvellous tales of the place for the remainder of his life. It was not till the reign of James II. that the monks were driven away from the place, and the mystery of the dark cavern dissolved.”
From Killaloe to Portumna, the Shannon flows through Lough Derg, a wide-spread waterway, an elaborate expansion of the river itself. This lake, which is twenty-five miles long and from two to six miles in breadth, has an average depth of about fifty feet. Close to Portumna is the Castle of Ballynasheera, said to have been once the residence of Ireton, Oliver Cromwell’s son-in-law.
From Ben Hill, a few miles below Portumna, near Woodford, is a splendid view of Lough Derg and the surrounding country. The lake here stretches along between the Slieve Aughty Mountains on the Connaught side and the Arra Mountains on the Munster side, whose lofty summits tower up high into the clouds. The shores, sloping gradually down to the water, are covered with luxurious foliage, through openings in which may be seen the ruins of many an ancient castle and once stately mansion.
Portumna itself is a flourishing town, but of no great antiquarian interest. The population of town and district is about two thousand.
Near by is Victoria Lock, Melleek, adjacent to which are two strongly built towers, which formerly mounted eight guns, and which, in more romantic times, were erected to guard the pass of the Shannon between Connaught and Leinster.
