Siberian Forests

South of the middle Ob, the western Siberian forest gives way in places to extensive peat bogs. The Vasyugan wetlands occupy a flat divide between the Ob and Irtysh basins, where sluggish drainage has allowed peat to accumulate over thousands of years. Rivers including the Bolshoy Yugan rise in this waterlogged country and flow towards the Ob. Lakes, marsh and coniferous woodland together cover much of the low plain.