As soon as you begin, go forward and to the left of where Nadine is standing. Drop down safely to the ledge by pressing circle and shimmy across to grab treasure #58 on the other side of the rock.
The next one is pretty close, so follow the linear path until you come to the plank that you have to cross over. Vault up into the gap above and crouch through to the other side.
When you drop down you’ll be prompted with L3 to look at the helicopter flying overheard. In front of you is a pool beneath a waterfall.
Dive beneath the pool to find treasure #59 on the rocks at the bottom.
Keep going until you come to a muddy slope with some handholds on the other side. For this treasure, you’ll have to ride the slope down and jump to a ledge on the left at the bottom.
Before you jump, you should be able to turn the camera enough to see where you need to get to – there’ll be yellow handholds and a piton-able wall. If you don’t make it on the first try, you’ll just fall into the pool of water from before. Climb back up and try again.
Once you grab hold of the wall, simply climb up and go forward to find treasure #60 sitting close to the edge.
After you fall from the next muddy slope you’ll have to swing across to the path behind the waterfalls.
As soon as you get to the yellow fence with the gap at the top – don’t climb it yet - head right to find treasure #61 hiding behind a rock.
The next treasure can be found before the cutscene, which means you need to ignore following Nadine and Sam as they use the grapple hook to climb to an upper ledge.
Once you’ve cleared the two muddy slopes, you should be able to turn around and see the train bridge in the distance by standing at the edge of the cliff.
A little to your right is where you can safely drop to the ledge. From here, just follow the handholds to treasure #62.
After falling (once again) down a bunch of slopes and rope swings, you’ll attach yourself to a piton-able wall. Vault up and look to your right to find the handholds to begin making your way back up.
Nadine and Sam will construct a grapple hook point for you but ignore it for now. Instead of throwing the rope, traverse right and down to a lower platform.
Pick up treasure #63 and then continue on your way.
The next treasure isn’t far from here – once you’ve moved the wheeled cart across the tracks and broken down the wall, Sam will go ahead to find a way through the tunnel for you.
The place you hoist him up is exactly where the treasure is.
Go back outside to move the cart up against the wall and Sam will drop a crate down. Climb up and head through the tunnel on the right for treasure #64.
After climbing up the crate, traverse your way around the cliff. Ahead of you will be a rope swing point where you have to reach the window on the other side. Don’t do this yet.
Instead, hang from the rope and turn around. Lower yourself down a little – there’s a ledge you can swing to from here that requires you to crouch down into a small space in the side of the cliff.
The last treasure of this chapter - #65 – sits in this gap.