2 sentences for 水源 (shuǐ​yuán — headwaters)

1. 长江的水源位于青藏高原的冰川地带。

   Cháng Jiāng de shuǐ​yuán wèi​yú Qīng Zàng gāo​yuán de bīng​chuān dì​dài.

   The source of the Yangtze River is located in the glacial regions of the Qinghai-Tibet Plateau.

   Source: Dong Chinese Dictionary

2. 考察队决定沿着这条河向上追溯，寻找水源。

   kǎo​chá duì jué​dìng yán​zhe zhè tiáo hé xiàng​shàng zhuī​sù, xún​zhǎo shuǐ​yuán.

   The expedition decided to trace back up the river to find the water source.

   Source: Dong Chinese Dictionary