noun
source of a river; headwaters; water source area
Refers to the geographical area where a river or water supply originates, often used in environmental or geographical contexts.
この川の水源地は国立公園の中にある。
The source of this river is inside the national park.
水源地の森林を守ることは、きれいな水を保つために重要だ
Protecting the forests in the water source area is important for maintaining clean water.