Meaning of 河源 in Japanese

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Definition of 河源

みなもと(minamoto) 【源】

(n) source; origin
もう一つの面白いエネルギー源は、放射能の廃棄物質から取り出せる熱である。
Another interesting source of energy is the heat that can be recovered from radioactive waste material.

かわ(kawa) · がわ(gawa) 【川 ·河】

(n) river; stream
この川はあの川の３倍長い。
This river is three times longer than that one.
(suf) the .... river; (suffix used with the names of rivers)
信濃川と阿賀野川ではどちらが長いですか。
Which is longer, the Shinano River or the Agano River?

げん(gen) 【源】