Around the world, most major cities are situated the world, most major cities are situated mountains, usually in a valleyat elevations above 500 m. along rivers, oceans, roads, or train routeson the more northern continentsin agricultural areas

Along rivers, oceans, roads, or train routes

Explanation:

In the world, the most main cities are situated along rivers, oceans, roads or train routes.

For example, in Paris, there is a Seine river. Usually, small places are settled near the mountains.

The most train stations are settled in the center of those major cities which is good for people. Rivers, oceans, roads, and train routes are settled in those cities because of the traffic and it is easier for people and tourists to function.