Fjords are formed when a glacier retreats after carving its usual u-shaped valley, and the sea fills the valley floors, creating a deep, long, narrow body of water, often with steep valley sides and reaching far inland. They’re found in locations where the past glaciation eroded the glacial troughs below the current sea level, meaning after the last ice age, the water submerged the lower parts of the valley, e.g. – Sognefjord in Norway (as shown above – and where I’d really love to visit one day!)

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