水源 (shuǐyuán) means "water source," referring to a place where water originates or can be found, such as a spring, river, or well. It is used when discussing the origin or availability of water.
这个村子的水源来自山上的泉水。
Zhège cūnzi de shuǐyuán láizì shānshàng de quánshuǐ.
The water source of this village comes from spring water in the mountains.
沙漠里找到水源是最重要的事。
Shāmò lǐ zhǎodào shuǐyuán shì zuì zhòngyào de shì.
Finding a water source in the desert is the most important thing.
我们必须保护好城市的水源。
Wǒmen bìxū bǎohù hǎo chéngshì de shuǐyuán.
We must protect the city's water sources.