- use a 1000 kg 4mm rope 

- coil rope on ground in small loops spiraling in direction of throw

- find a 50cm green wood stick

- attach stick to end of rope with slip knot

- attach other end to something solid

- throw stick over river into a tree

- pull until fast or repeat until successful

- re-tie original end to a high point and tension the rope using slip knot pulley

- remember that rope will sag between suspension points, final section always uphill

- clip onto rope and cross river