• 河川かせん — rivers / waterways
• 銀河ぎんが — galaxy / Milky Way
• 黄河こうが — Yellow River (China)
• 山河さんが — mountains and rivers
• 運河うんが — canal / waterway
• 大河たいが — great river

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河 combines the water radical 氵 with the phonetic 可, indicating a sizeable flowing body of water. It is common in geographic names and compounds.