How to understand the left bank and right bank, concave bank and convex bank of a river?

Because of the earth's rotation, the geostrophic deflection force is generated, and the rivers are also affected. The northern hemisphere leans to the right and the southern hemisphere leans to the left.

If it is in the northern hemisphere, the river inclines to the right, scouring the right bank, and sediment accumulates on the left bank. The left bank of rivers in the northern hemisphere is a convex bank, and the bank washed by water is a concave bank. This bump is easy to understand. The washed soil is concave and the piled soil is convex.

Just remember that the northern hemisphere is the right hemisphere and the southern hemisphere is the left hemisphere.