The stone walls of Inis Óirr and the Aran Islands in general are really are of the most impressive and peculiar sights on Inis Óirr. The miles and miles of stone walls define the farmers fields on the Aran Islands. They usually end up being one of decriptive features of a tourists description of their trip. The criss-cross of stone walls collectively add up to thousands of miles. The best place to gain a real perspective on the extent of the stone walls is by walking/cycling to the southern end of the island where you see nothing BUT stone walls, or a great over head view can be gained from O’Brien’s Castle.