From the ledge that overlooks the river, jump to grab the handhold on the left pillar. Jump to grab the handhold above and traverse to the right around the corner. Jump to grab the handhold on the pillar behind...

... and traverse to the left around the corner. Drop to the beam below and walk on it until you reach almsot the middle of it.

Turn left and jump to grab the horizontal pole than spans the two pillars beyond. This a long jump and Lara will grab the pole with one hand, so press the Interact button to save her. Swing on the pole and jump to grab the handhold on the wall ahead.

Traverse to the right until you reach the end. Jump back to grab the handhold on the pillar behind...

... and release to grab the lower handhold. Jump to grab the handhold on the pillar to the left and drop on the beam. Walk to the other side...

... and hang from the beam. Release three times to grab the lower handholds and land on the stone block. Finally, drop to the ground.