How does a lake differ from a river; a pond from a lake; a lake from a sea; a sea from? reservoir river from the canal?

The lake differs from the river in that the lake is closed and has stagnant waters, and the river has a source and channel along which flowing waters flow to the sea or ocean. A pond is an artificial structure on a river, and a lake is a natural depression on the surface of the earth. A lake differs from the sea in that it has fresh water and is in a closed position on land, that is, it is not connected with the waters of the world’s oceans or with any others. The sea differs from the reservoir in that the sea is of natural origin and contains salt water, and the reservoir was created by people artificially and the water in it is fresh. The sea is also much larger than the reservoir. The river differs from the canal in that the river is a natural body of water, and the canal is of artificial origin.