Drumaleague Lough () is a very small freshwater in northwest Ireland. The ecology of Drumaleague Lough, and other Leitrim waterways, remain threatened by zebra mussel and other invasive species. Etymology The origin of the lake name is unknown, but () means the "". Geography Drumaleague Lough lies south of both Drumcong village and Carrickaport Lough, and southwest of Lough Scur. This eclipitical shaped lake is very small, covering a surface-area of about , measuring in length from west to east, and north to south, with depths of up to and a very soft mud bottom. Drumaleague Lough is connected to Lough Conway to the west, and Lough Scur to the east by the Shannon–Erne Waterway. Ecology The presence, and type, of fish found in Drumaleague Lough is not recorded. Human settlement The primary human settlements near Drumaleague Lough is Drumcong village. Drumaleague Lough is bounded by the townlands of Letterfine to the north and east, Drumaleague to the west, and Seltan (McDonald) to the south and east. Heritage Ancient lake dwellers Two ancient crannogs existed at Drumaleague Lough during the Middle Ages at least. The crannogs were discovered during the 19th century, . Drumaleague crannog number one a good example of lacustrine dwelling, and with the exception of the hearth-stones, was composed entirely of wood, mainly Alder. The annexed plan conveys a good example of the general arrangement of a crannog, with an outer line of stakes enclosing a circle in diameter. Stakes driven into the ground were positioned in a single row in some parts of the island, and in double or treble rows, or clusters, in other parts, seemingly for purposes related to some internal arrangement. Because the foundation is very soft, the layers of timber are very deep. A, the central oblong portion, consists of a platform of round logs cut in lengths of 1.2m to 1.8m, possibly the floor of the hut ; B, a collection of stones with marks of fire on them ; C, a heap of stiff clay; D, the root of a large tree nearly buried in the peat, the surface of the wood bevelled off, so as to form a sort of table, under which was foimd a considerable quantity of bones, apparently those of deer and swine. Drumaleague crannog number two measured in diameter. The annexed section conveys a good example of the flooring of an oblong house for this