Lough Nasuil

17mi/28km southeast of Sligo on the N4 we come to Lough Arrow. If, on driving round it, we take a turning off to the east at Castle Baldwin, we come to the Heapstown Cairn and then continue east to Lough Nasuil. In 1933 this remarkable little lough, some 330yd/300m in diameter and normally containing some 1,308,000cu.yd/1,000,000cu.m of water, suddenly emptied, remained dry for three weeks, and just as suddenly filled up again.