In the Lysefjord in Norway.

"End to end, it measures 42 kilometres (26 mi) with rocky walls falling nearly vertically over 1,000 metres (3,300 ft) into the water. Not only is the fjord long and narrow, it is in places as deep as the mountains are high. Starting at a depth of only 13 metres (43 ft) deep where it meets the sea near Forsand village, the Lysefjord then heads inland and drops to a depth of over 400 metres (1,300 ft) below the Preikestolen."

en.wikipedia.org/wiki/Lysefjord

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