| Iksa | |
| Other Name: | Икса |
| Source1 Location: | Vasyugan Plain |
| Source1 Coordinates: | 56.3331°N 82.1606°W |
| Mouth: | Chaya |
| Mouth Location: | Podgornoye |
| Mouth Coordinates: | 57.7736°N 82.6292°W |
| Progression: | Chaya → |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 430km (270miles) |
| Discharge1 Avg: | 15.05m3/s (68km (42miles) from the mouth) |
| Basin Size: | 6130km2 |
| Pushpin Map: | Russia Tomsk Oblast |
| Pushpin Map Caption: | Mouth location in Tomsk Oblast, Russia |
The Iksa (Russian: Икса) is a river in Novosibirsk Oblast and Tomsk Oblast, Russia. It is the longest tributary of the Chaya, with a length of 430km (270miles) and a drainage basin area of 6130km2.
The basin of the river is located in the Chainsky, Bakcharsky and Kolyvansky districts. There are a number of rural settlements near its banks, such as Plotnikovo, Borodinsk, Kopanoye Ozero, Vostochnoye and Ermilovka. A stretch of its lower course is navigable.[1]
The Iksa has its sources in the Vasyugan Plain, part of the West Siberian Plain. It flows in an eastern direction in its upper reaches and then in a roughly northern direction all along its middle and lower course. Finally it meets the right bank of the Chaya near Podgornoye, 140km (90miles) from its mouth in the Ob.[2] [3]
The main tributaries of the Iksa are the 25km (16miles) long Elanka (Еланка) and the 38km (24miles) long Antik (Антик) on the right, as well as the 26km (16miles) long Rybnaya (Рыбная) on the left. There are numerous small lakes and swamps in its basin, especially to the west of its middle course. The river is fed by snow and rain. It is frozen between October and April.[3]
