| Sym Сым | |
| Pushpin Map: | Russia Krasnoyarsk Krai |
| Pushpin Map Caption: | Mouth location in Krasnoyarsk Krai, Russia |
| Source1 Location: | West Siberian Plain swamps |
| Source1 Coordinates: | 61.4317°N 86.0178°W |
| Source1 Elevation: | 180m (590feet) |
| Mouth Coordinates: | 60.2914°N 90.1°W |
| Mouth Elevation: | 43m (141feet) |
| Length: | 694km (431miles) |
| Basin Size: | 31600km2 |
The Sym is a left, western tributary of the Yenisey in Krasnoyarsk Krai, Russia. It is long, and has a drainage basin of . It is navigable about 265km (165miles) upstream from its mouth.[1]
The Sym begins at a height of 180m (590feet) in a swampy area of the West Siberian Plain. It flows roughly southeastwards across flat and often boggy areas, forming increasingly wide meanders. About 50km (30miles) before the mouth it bends and flows in a roughly ENE direction, finally joining the left bank of the Yenisey between Yarzevo and Krivlyak.[1]
The river freezes in October or early November and stays frozen until May. Its main tributaries are the Alsym, Kukocha, Oksym and Kolchum from the right and the Kidenches from the left. The settlement of Maiskoye is by the Kolchum.[1]
Historically the Sym was first reached by Ket serving men in 1605, while a detachment from Mangazeya ascended the Yenisei to its confluence with the Sym in 1610.[2]