関連ワード:  write a short note on river krishna    write a short note on river pollution    write a short note on river    write a short note on river ganga    write a short note on river indus    write a short note on river kaveri    write a short note on river pollution class 9    write a short note on river water conflicts in india    write a short note on river narmada    write a short note on river system of australia