A river typically flows at somewhere between 1 and 6 knots. You could probably row downstream in a trireme at a maximum of 12 knots or upstream at around 3 knots. A knot is one nautical mile per hour. 12 knots is about 13.8 mph.
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It then flows through the Amazon rainforest, the largest tropical rainforest in the world, before emptying into the Atlantic Ocean in Brazil. The Amazon River is approximately 6,800 kilometers long, making it the longest river in the world.
This edition mentions that typical passage times from New York to the English Channel for a well-found sailing vessel of about 2000 tons was around 25 to 30 days, with ships logging 100-150 miles per day on average.
Therefore, in the aviation and nautical worlds, knots are oftentimes used in place of MPH and KPH since they are easier to navigate with. Unlike statute – or land based – miles, nautical miles are based directly on the Earth's degree of latitudes. One nautical mile equates exactly to one minute of latitude.