I don't actually know....
Most rivers do not flow to the south. Rivers can only flow from areas of higher elevation to lower elevations, taking the route of least resistence. This is regardless of whether rivers are in the northern or southern hemisphere.
Some of the world's greatest rivers on the northern hemisphere include the Nile in Africa, the Amazon in South America, and the Yangtze in Asia. These rivers are significant in terms of length, discharge, and their impact on the regions they flow through.
Gravity, not gods cause rivers to flow. Most rivers in the northern parts of continents flow from south to north.
You would have to look very hard at many maps to answer this one, but at first glance I don't think that it's true. What about all those rivers that run East/West, or West/East? What about the River Severn which starts off running NorthEast, but ends up running SouthWest? What about the Yellow River in China which altered course in 1852 over its final 300 miles, previously flowing East with a bit of South, now flowing NorthEast?
In the northern hemisphere, ocean currents generally flow clockwise due to the Coriolis effect, which is caused by the Earth's rotation. This effect causes moving fluids to curve to the right in the northern hemisphere and to the left in the southern hemisphere.
Anticyclones in the northern hemisphere rotate clockwise while those in the southern hemisphere rotate counterclockwise.
Cold currents generally flow towards the equator. (a.k.a. south).
Northern
In the northern hemisphere, gyres flow in a clockwise direction. This is due to the Coriolis effect, a result of the Earth's rotation causing moving air or water to be deflected to the right in the northern hemisphere.
The Mississippi, the Missouri, and the Ohio Rivers flow south.
oklahoma's rivers flow south-east
In the northern hemisphere, the surface currents generally flow in a clockwise direction due to the Coriolis effect, which is caused by the Earth's rotation. This means they move to the right of the wind direction in the northern hemisphere.