Details: This poster shows a fjord at night with a full moon over the water. At the bottom it says Moonlight Fjord .
A fjord (or fiord) is a long, narrow estuary with steep sides, made when a glacial valley is flooded by the sea. The seeds of a fjord are laid when a glacier cuts a U-shaped valley through abrasion of the surrounding bedrock. At the end of such a period, the climate warms up again and glaciers retreat. The valleys left behind are filled with seawater, forming fjords. Fjords are often very deep in their upper and middle reaches