Originally Posted by davidpm
You are sailing down a river with a sharp bend. Is the current strongest on the outside of the bend or the inside?
Current strongest? Generally on the outside.
Fastest path? Generally outside going downstream, inside going upstream.
That's due to more erosion/deeper on the outside. But I could envision a deeper channel on the inside, such as a river going through swamps (Where exactly is the outside?) or a man-made river where the channel isn't necessarily on the outside.