Actually, it was explained to me that it's like that stretch of road somewhere in Kentucky where your vehicle will roll uphill. A school bus crashed years ago killing all the children and their little ghost hands push stuff up hill for all eternity.BigBlueFanGA is correct. Rivers flow due to elevation changes. The miniscule difference in the acceleration of gravity at the equator and at the poles is inconsequential. Any noncompressible fluid of a given density and specific gravity would also flow downhill. Simple hydrodynamics.