Afon Viljuj
Afon Vilyuy (Rwseg: Вилюй) yw'r hwyaf o lednentydd Afon Lena yn nwyrain Siberia, Rwsia.
Mae hi tua 2,650 km o hyd, ac mae ganddi ddalgylch o tua 454,000 km².
 | |
| Math | afon  |
|---|---|
| Daearyddiaeth | |
| Sir | Gweriniaeth Sakha |
| Gwlad |  Rwsia |
| Cyfesurynnau | 65.9781°N 103.5136°E, 64.3772°N 126.415°E |
| Tarddiad | Central Siberian Plateau |
| Aber | Afon Lena |
| Llednentydd | Afon Ygyatta, Afon Markha, Afon Tyukyan, Afon Tyung, Ulakhan-Vava, Chona, Afon Bappagay, Afon Tangnary, Chybyda, Ulakhan-Botuobuya, Akhtaranda, Kempendyay, Ochchuguy-Botuobuya, Mostovka, Chirkuo, Vilyuychaan, Vavukan, Mogdy, Lakharchana, Ilin-Dyeli, Sredny Vilyuykan, Verkhny Vilyuykan, Kyundyaye, Tonguo |
| Dalgylch | 454,000 cilometr sgwâr |
| Hyd | 2,650 cilometr |
| Arllwysiad | 1,468 metr ciwbic yr eiliad |
| Llynnoedd | Vilyuy Reservoir |
Ceir tarddle'r afon ger Ekonda. Mae'n llifo tua'r dwyrain trwy Gronfa Viluyskoe a heibio trefi Cherynshevskiy, Suntar, Nyurba, Vilyuisk a Verkhnevilyuysk cyn ymuno ag Afon Lena ger Sangar.
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