Rivyè se yon kou dlo ki koule natirèl, anjeneral dlo dous, k ap koule nan direksyon pou yon oseyan, lanmè, lak oswa yon lòt rivyè nan syans idwografi.
Nan kèk ka, yon rivyè koule nan tè a epi li vin sèk nan fen kou li san li pa rive yon lòt kou dlo.
Yon rivyè gen yon debi mwayen ak modere (pi plis pase 2 m3/s), k ap resevwa aflyan yo ak koule nan yon lòt rivyè oswa yon flèv.
Lè substra a pèmèt li (ase porè), rivyè a ka akonpaye pa yon konpatiman ekolojik paralèl kote dlo a ap koule pi dousman, di konpatiman souflivyal.
Mo rivyè a soti nan lang franse a (rivière).
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