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entering a canal lock near Nuremberg
This is aboard the UniWorld cruise ship River Ambassador, or as I came to think of it (with apologies to Steve Martin) the Immer Trink. Getting to the Danube from Nuremberg means navigating a canal that traverses a watershed over 500 feet high. Water is constantly pumped up to the highest part of the canal to feed the locks, some of which are capable of raising or lowering a ship more than 80 feet.