The Psel has a length of 717 kilometres (446 mi) and a drainage basin of 22,800 square kilometres (8,800 sq mi). The river's right bank is high and steep, unlike the low, left bank. Its periods of freezing range from the end of November till the middle of March.
Important tributaries of the river include: (R): Sudzha, Grun', and Khorol; (L): Pena, Grun'-Tashan', and Goltva.
The fauna on the riversides of the Psel includes hares, foxes, deer and wild boar, beavers. There are a great variety of birds, such as wild duck, gray heron. Along the riversides there are forest areas, are predominantly deciduous trees. There are also conifers on the sandy areas of the bank. There are also numerous meadows.
In the river there are about 50 species of fish such as crucian, bream, tench, roach, etc. There are also catfish, pike, perch.