A maritime county in the W. of Ireland, in the province of Connaught; Lough Corrib (25 m. long) and Lough Mask (12 m. long), stretching N. and S., divide the county into East and West districts; the former is boggy, yet arable; the latter, including the picturesque district known as Connemara, is wild and hilly, and chiefly consists of bleak morass and bogland; its rocky and indented coast affords excellent harbourage in many places; the Suck, Shannon, and Corrib are the chief rivers; the Slieve Boughta Mountains in the S. and in the W. the Twelve Pins (2395 ft.) are the principal mountains; fishing, some agriculture, and cattle-rearing are the chief employments; it contains many interesting cromlechs and ruins.