IMPORTANT: This is another tricky sequence. To be sure you don't get stranded, save your game beforehand and do not overwrite that save until you're safely back on the riverbank.

The path to the ammo is marked with pink arrows in the diagram above. The letters in parentheses refer to the ones in the diagram. The sequence is also shown in this short video walkthrough.

After jumping across the river from the GREEN CAVE, Lara will be standing on the tree root (B in the diagram). Turn to face the ledge (C) to the right of the cave opening.

The items we're after are on the ledge across the water to the right (labeled 'Ammo' in the diagram). It's not possible to jump directly from the tree roots to that ledge, so we'll have to take a roundabout path.

So take a running jump from the tree root across the water to the green stone ledge (pink-and-blue arrow from B to C in the diagram).

Move along this ledge to the slightly higher point (D). It is important to start from the highest point on this ledge in order to make the next jump.

Turn right, walk to the edge, and carefully position Lara so she's facing the middle of the big tree on the opposite bank.

Hop back and then take a running jump across the water...

...to grab the sloping base of the tree on the other bank (D to E).

Traverse to the right and pull up (E to F).

Hop over to the ledge where the ammo is sitting (G). Pick up Uzi clips and harpoons (items 16-17).

Now for the return trip. You may want to save before attempting the following. Just be sure you don't overwrite your previous save in case you can't get back and need to reload the earlier save.

Move to the end of the ledge near the corner (H) and turn right to face across the water toward the tree where you started (I).

Position Lara on the left (higher) side of the block nearest the wall, facing the left side of the block that forms the nearest tree root.

Hop back, take a running jump across the water...

...and grab the edge of the root (H to I in the diagram). Then traverse to the right and pull up. (If Lara won't grab using this precise positioning, see the alternatives below.)

Finally, take a series of standing jumps around the tree to the wide riverbank beyond.

- OR -

If you try to grab the root, and Lara won't cooperate, instead, aim for the middle of the root, rather than the left side. Take the running jump without grabbing and continue to hold Forward and Jump while Lara is in the air. She should then do a little stutter-step at the edge of the tree root but still nail the landing. (If this description isn't clear, watch the video to see what I mean.)

- OR -

If you're having trouble with the jump back to the tree root, try the following alternate path, which is also shown in the video. After picking up the ammo, turn around and jump back to the tree root where you pulled up earlier (F).

Position Lara at the back corner of the flat, triangular part of the root, so she's facing the right end of the green ledge. If you're playing with classic tank controls, you must line her up in this odd way in order to have enough space to take the next running jump. If you face the ledge where you want to land, then try and run and jump, she'll fall into the water before take-off.

From the position shown in the previous screenshot, use the Forward, Left, and Jump buttons to run forward and around to the left, as indicated by the broken arrow. Lara should then take off right at the edge. While she's in the air, press and hold Action to grab the green ledge (approximately F to C in the diagram). Then pull up.

From here, it's a simple running jump across the water to the tree (C to B). From there, walk to the upper right corner of the flat spot and jump back to the ledge where you started.

[Part 1| River Ganges 100% Guide]