The Psel has a length of 717 km and a drainage basin of 22,800 km². 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, predominantly deciduous trees. There are also conifers on the sandy areas of the bank. There can be find numerous meadows.
In the river we can find about 50 species of fish such as crucian, bream, tench, roach, etc. There are also catfish, pike, perch.