forcing them to find a guide. They first crossed Ak Termel (modern Ona - a tributary of Abakan). However, after ten nights of searching for a way out, their...

Bolshoy Yenisei (Biy-Hem) river - Class IV Ulug-O river - Class IV Ona [ru], Abakan rivers - Class IV Oka river - Class IV Zhombolok river - Class IV (V)...