Are all the rivers and oceans in the world artificially connected?

All the rivers and seas in the world are not artificially connected, but many rivers and seas are connected through geographical formation and water circulation. Rivers are natural water flow systems on the earth, and their formation and flow direction are the result of natural influences such as crustal structure, rainfall and snowmelt. River water usually comes from mountainous areas or highlands, flows through lowlands and finally flows into the ocean or other water sources. The ocean is a vast body of water composed of various oceans and seas, which are connected with each other by natural flows and ocean currents. The generalized world refers to all, all and everything. Generally speaking, the world refers to the earth on which human beings live. The world is also called heaven and earth, world, this shore, world, everything, world and so on.