Ms Rotterdam in the Norwegian fjords.
The Nile, Africa
The Nile is the longest river in the world, with a total length of 4130 miles (6650 km). The river runs through ten countries: Sudan, South Sudan, Burundi, Rwanda, the Democratic Republic of Congo, Tanzania, Kenya, Ethiopia, Uganda and Egypt. The name Nile comes from the Greek "neilos", which means valley, although the ancient Egyptians called it the River Ar (meaning black) because of the colour of the sediment left after the river's annual flood. These days, cruise fans can explore the river on traditional feluccas or larger, more luxurious vessels.
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There are stretches of the River Thames , Cookham, Bray through Boulters Lock that are absolutely beautiful.. and I have seen a few rivers.