There are a lot of rivers in the Philippines. Some are swimmable, other too wild. Some are all over Google because they are famous and well visited, others are hidden.
Almost all of them are used for washing, either clothes or people. They are seldom used for transportation, for they run wild.
Although….in some places not so wild anymore. Since canalisation of river beds is happening all over the place to prevent flooding.
I took some photos of rivers on Negros Oriental, in the Valencia Area, where the sulfide smoke escapes the earth and some rivers turn red because of iron.