Today we went for a walk along the river. It was the first time we had seen a "Lock". When the river is too steep the put Locks in it like steps on a staircase so boats can move up it. You have to open and close the big doors so you can change the water level and allow the boat to move up or down the river. We got to help the boat owners to do this, it was cool. There were 31 Locks in this stretch of river....ALOT.
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