River system is made up of a river and its what

A river and all its tributaries make up a river system. Tributaries are streams and smaller rivers that feed into a main river.

Mexico has a host of environmental problems, including significant chemicalpollution  from factory discharges and waste dumping, but the main threat to itsbiodiversity  probably stems from  deforestation  and other natural habitat losses. forest habitat is lost for a number of reasons

Sorry but there isnt a map i would love to but if u can paste the picture of the map in my comment and i will you