​COLL, an island of the Inner Hebrides, Argyllshire, Scotland. Pop. (1901) 432. It is situated about 7 m. west of Caliach Point in Mull, and measures 12 m. from N.E. to S.W., with a breadth varying from ¾ m. to 4 m. It is composed of gneiss, is generally rather flat, save in the west where Ben Hogh reaches a height of 339 ft., and has several lakes. The pasturage is good and the soil fairly fertile. Much dairy produce is exported, besides sheep and cattle. The antiquities include stone circles, duns, the ruins of Breachacha Castle, once a fortress of the Lords of the Isles. A steamer from Oban calls regularly at Arinagour.