What does canals do?

swez canal is the second largest but the one in china is the largest

There are canals in many countries in many parts of the world. Without a name the question cannot be answered.

because it is an artificial (man made) river

The Suez canal is by far longer over l00 miles. it is on level terrain, so to speak and does not employ locks. at one time there were movable bridges across the canal for traffic control, but these...

It is classed as a sea-level canal. it does not use locks, it did have movable bridges more or less for traffic-control entering and leaving the canal but these did not have anyting to do with...