Simmi
The Simmi winds across the northern part of the middle Amur plain towards Lake Bolon. At its mouth, the river spreads through wetlands dotted with small lakes, old channels and bays. Together with the neighbouring Kharpi, it helps sustain a great expanse of marsh and meadow beside the lake. Waterbirds gather here during their migrations, and the shallow waters provide feeding and spawning grounds for fish of the Amur basin.