river source
Source of the Amazon River
Source of the Nile
Spring (hydrology)
Strahler number
Water well
/suto3/google.iconriver source
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/suto3/Google定義検索.icon river source
/suto3/wikipedia.iconriver source
/suto3/weblio.icon river source
/suto3/kotobank.icon river source
/suto3/jisho.icon river source