A fjord (from the Norwegian; spelt fiord in North America and New Zealand) is a long, narrow arm of the sea, formed as a result of erosion by a valley glacier.

Visible light satellite image of Scoresby Sund, the largest fjord system on Greenlandís east coast. On the left is the (white) Greenland ice sheet. The grey area on the right is low cloud. Note the many icebergs. NASA image Terra, MODIS, 13.40 UTC, 21 Aug. 2001.