What is the Right Bank and the Left Bank?

Depending on which Right Bank and Left Bank is being asked about:

Vehicles:

The right bank of the engine is on the right side and the left bank of the engine is on the left side. This is noted as you are sitting in the drivers seat.

Paris, France:

La Rive Gauche, or the Left Bank, is the is the southern bank of the River Seine in Paris. La Rive Droite, or the Right Bank, is the northern bank of the river.

Bordeaux Region of France:

Right Bank and Left Bank are also wine growing regions in the Bordeaux wine regions of France.

Streams:

There is a right bank and a left bank of streams such as rivers. The sides of a stream are named (right or left) relative to a view downstream.