forests feed our rivers,which are a vital part of our natural eco-system,providing water for drinking,for agriculture,for transport and also as a habitat for the country's main source of protein,fish.when the tonle sap floods each year,our forests provide important nutrients that help rice production and also play an important part in our fisheries.water links every species on earth and rivers are the lifeblood of every country.every river system has it's own geographical catchment area,known as a watershed.in the case of the tonle sap lake watershed,it receives its water upply from many parts of the country. in the example of the stung sen and stung chinit watersheds,which we will be looking at later,they take their water from a wide area covering several provinces.