a noteworthy tributary is the msunduzi river, which joins it between nagle and inanda dams. higher up its course, the msunduzi (or 'dusi' for short) passes through the kwazulu-natal capital pietermaritzburg. a famous downriver race, the dusi canoe marathon takes place between the capital and durban, attracting thousands of canoeists for the three-day event held in january every year.