Fjord- a long, narrow, deep inlet of the sea between high cliffs, as in Norway and Iceland, typically formed by submergence of a glaciated valley.
Most fjords have a v or u shape leading to a valley or river
A fjord is formed when a glacier retreats, after carving its typical U-shaped valley, and the sea fills the resulting valley floor.
Most fjords are deeper than the adjacent sea; Sognefjord, Norway, reaches as much as 1,300 m (4,265 ft) below sea level. Fjords generally have bedrock at their mouth caused by the previous glacier's reduced erosion rate
Alaska has the most number of Fjords formed