Gabriel Channel, a remarkable channel in Patagonia, between Dawson island and Tierra del Fuego, about lat. 54° 20' S., Ion. 70° 40' AT. It is 25 m. long and from 1/2 to 1 1/2 m. wide, with shores nearly parallel. The X. shore is a ridge of slate rising to a sharp edge and descending abruptly on the other side into a valley. The S. shore is a mass of mountains, two of which, Mts. Buckland and Sarmiento, are remarkable. The former, estimated to be 4,000 ft. high, is a pyramidal peak of slate; the latter, 6,800 ft. high, terminates in two peaks. The summit of the range between these mountains is an immense glacier, which forms as it melts many cascades that find their way into the channel. From the humidity of the climate these peaks- are usually enveloped in fogs. Whirlwinds sometimes descend the S. ridge and burst with violence on the opposite shore.