sulas lies the important Umanak [45] Fjord, which is one of the chief sources of the icebergs drifting down the Green- land coast. Seven active glaciers in icefalls descend from the inland ice cap into the branches of this body of water which are of sufficient importance to receive names on the Danish chart, while a half-dozen others are considered too insignificant for special designation. More bergs come out of Umanak Fjord than from Disko Bay, though the latter receives the discharge of the great Jakobshavn glacier and icefall which is the most active ice stream in Greenland and perhaps in the world, its summer rate of motion being stated to be 150 feet (3) per day. [See Northern and Disko I. and iceberg off Godhavn.]