Translation according to P. W. Joyce:
Drimcong in Galway ; the hill-ridge (druim) of the cong or narrow strait. See vol. ii. p. 409 [reproduced below].
Cong, conga, or cunga means a narrow neck, a strait where a river or lake contracts, the stream by which one lake empties itself into another very near it. It appears to be connected with cuing, which is the common word for the yoke borne by horses that are harnessed to a chariot or carriage. This term belongs chiefly to the north-west of Ireland; it is common in Donegal, where indeed it is a living word among the old natives who speak Irish; and it is found as a local appellative in this county, as well as in Mayo, Galway, and Tyrone. An adminrable example of its application is seen in Lough Nacung, a pretty lake at the base of Errigle mountain in the north-west of Donegal. This lake is connected with another - Dunlewy lake - by a very short and narrow strait, which is now called "The Cung," and which has given name to Lough Nacung, the lake of the "cung," or neck. Another cung connects this - which is called Upper Lough Nacung - with Lower Lough Nacung, from which the townland of Meenacung (meen a mountain meadow) takes its name. The narrow passage between Lough Conn and Lough Cullin in Mayo, now crossed by a road and bridge, has given name to Cungmore point, lying near the crossing. The best known example of the use of this word is Cong in Mayo, which derived its name from the river on which it is situated, connecting Lough Mask with Lough Corrib. But though this is the most remarkable place in Ireland of the name, the river is by no means a good characteristic example of a "cong," for it is somewhat scattered and partly subterranean. The great abbey of Cong is celebrated as being the place where Roderick O'Connor, the last native king of Ireland, past the evening of his days in religious retirement; and it still exhibits in its venerable ruins many vestiges of its former magnificence. It was either founded originally by St. Fechin in the seventh century, or was dedicated to his memory; and hence it is called in Irish documents Cunga or Conga Feichin. Lough Cong is the name of a small lake south-east of the Twelve Pins in Connemara; and there are two townlands, one near Maguire's Bridge in Fermanagh, and the other in Tyrone, with the euphonious name of Congo, all from the same word. The narrow strait connecting Ballycong lake with the lake of Carrowkeribly, in the parish of Attymas in Mayo, five miles south of Ballina, is called Dubh-conga by the Four Masters; and the ford over it was anciently designated Ath-cunga (Hy F.); this ford is now called Bel-atha-conga, the ford-mouth of the cong or strait, which has been anglicised to Ballycong, the present name of the small lake.