Fiord

Fiord, or fjord, coastal inlet characterized by sheer parallel walls. Deep bays and inlets along the mountainous coastline of Norway, fiords were probably formed by rivers and deepened by glaciers millions of years ago. Norway's fiords are noted for their size: Sognafiord is 4,000 ft (1,220 m) deep and over 100 mi (160 km) long. The terms sea loch and firth are used for similar inlets in Britain.