Lining
Also: lining, lining a boat
Lining means guiding the boat on a rope from the bank through a section you don't want to paddle.
It's an alternative to portaging when the bank is walkable and the boat is empty or lightly loaded. A line at bow and stern is easy to control. Careful: if the boat or line snags, a lot of pull can build up. Never wrap a line around your hand or body.