水源 (shuǐ yuán): water source; water supply; headwaters of a river

This village sits at the foot of the mountain, and for generations the villagers have depended on a nearby water source for their livelihood.

Before the climb, the guide reminded us to bring enough water, because there is no water source up on the mountain.

In order to protect the city's water source, the government shut down several chemical plants upstream from the reservoir.

Scientists found that this forest is the most important water source for the dozen or so villages downstream.

Once the dry season arrived, there was less and less water in the river, and the whole village was worried about the water source.