Forbidden Valley is the 3rd chapter in Sword of the Sea. This guide contains all collectible locations and everything you need for trophies/achievements.
Collectibles Overview:
Forbidden Valley Collectibles
This area is largely linear, involving progressing through the area on the back of the dolphin you freed in the prior area. Destroying the green crystals by running into them awards Astra.
Water Point #1 – In the first area, activate the lanterns near the pillar.
Water Point #2 – Around the base of the pillar the water leads to from the first point.
Water Point #3 – Instead of jumping up the ledge to continue, go to the left where there are lanterns in the middle of the raised area.
Water Point #4 – Jump up the two ledges to find the next set of lanterns required to progress.
Water Point #5 – After jumping over the wall with the jellyfish, go to the left up the sandfall to find a group of lanterns.
Water Point #6 – Follow the water path to the large group of lanterns by the tall sandfall.
Water Point #7 – Directly right of above before progressing, around the base of the pillar.
Water Point #8 – Instead of going up the second set of jellyfish, go to the left up jump up the two pillars to the higher level where there is a large group of lanterns.
Water Point #9 – In this area you start destroying large crystals to spread water. The first is up the first sandfall on the right.
Water Point #10 – Move around to the left and jump to the second on the platform.
Water Point #11 – Along the main path is a large group of lanterns required to get over the tall walls.
Water Point #12 – The next area has three crystals required to progress. The first is on the left by the wall with the turtle mouths.
Secret Shell #22 – Instead of activating the lanterns to reach the next crystal, follow the path around to the right and jump up the ledges. At the top is a set of lanterns between the green crystals. Activate them to make a jellyfish appear, which allows you to jump to the far pillar where you can find the only secret shell of the level, awarding Forbidden Valley Shell Collector 
.
Water Point #13 – After the first crystal, go left where there is a group of lanterns, which will spawn jellyfish allowing you to jump across the gap to reach the second crystal.
Water Point #14 – Continue up the platforms on the left to reach the third crystal, opening the path to continue. Before continuing, a bunch of the jellyfish in the area now have Astra appearing over top of them you can collect.
Water Point #15 – After the short side scrolling section is one final crystal, opening to path to complete the area, awarding Cleanse the Forbidden Valley .
NEXT: Shadow Tundra
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