Why does the middle Ob River have a network of channels?

The middle Ob River flows through a complex network of channels primarily because it traverses the taiga (swampy coniferous forest) with a minimal gradient and an exceptionally wide floodplain, which spans 12 to 18 miles (19 to 29 km).1

In this region, the river's valley broadens significantly to between 18 and 30 miles (29 to 48 km). The combination of this very low slope and the vast, expansive floodplain allows the river to spread out and form its characteristic branching pattern. During periods of high water, these floods can occasionally extend across the valley for 24 to 80 km (15 to 50 miles).1