A fjord is a long, narrow, deep inlet of the sea between high cliffs or steep slopes, created by the submergence of a glaciated valley. Fjords are significant features in the study of glacial geomorphology, providing insights into past glacial activity, sea level changes, and the interaction between glaciers and coastal environments.
Source Syvitski, J. P. M., & Shaw, J. (1995). Sedimentology and Geomorphology of Fjords. Elsevier.