How to distinguish the left bank and the right bank of a river?

The difference between the left bank and the right bank of a river is as follows:

1. Terrain: You can judge whether the terrain is a valley or a ridge by the size and density of contour lines.

2. Geostrophic bias: Rivers will erode the banks in the process of flowing. Due to the influence of geostrophic deflection, the northern hemisphere tilts to the right and the southern hemisphere tilts to the left.

The northern hemisphere leans to the right, the right bank of the river is eroded and the left bank is piled up. The southern hemisphere leans to the left, the left bank of the river is eroded and the right bank is piled up. Namely concave bank erosion and convex bank accumulation.

3. River width: The river is getting wider and wider from the source to the estuary, towards the direction where the river line becomes thicker, with the left bank on the left and the right bank on the right (the river flow direction can also be judged according to the topographic map, the river source is high and the flow is low, and the big rivers in China mainly originate in the northwest and flow to the southeast).

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