The Docks are a location in Hyrule Castle from Breath of the Wild.
Breath of the Wild
Guarded mainly by Black Lizalfos, the Docks are located underneath the castle and are built in a cavern that opens to its northern end. The cave can be entered by water or by finding the pathway lining the eastern side of the cave's mouth. In there, a Great Flameblade flanked by two torches, and following the pathway leads to a staircase.
The docks proper have a couple of the aforementioned Black Lizalfos, and a couple of wooden chests can be found in the water, containing Shock Arrows and an Ancient Arrow. There are couple of underwater metallic chests containing a Star Fragment and a Gold Rupee. The waters in the dock may also contain Hearty Salmon.
Though visible from outside, the area behind the two barred openings under the stairs cannot be accessed into.
Once one goes up the stairs, a large beacon pyre can be lit to reveal the Saas Ko'sah Shrine. Going further up past the shrine, there's a pathway through the cavern that leads to an opening blocked by a metallic bookshelf leading to the Library.
Nearby Korok Seeds
A single stone can be found on a shelf in the cliffside close to the water. Lift the stone to reveal the Korok.
The bombable rocks can be found rather high up on the cliffside. Break the rocks and lift the stone to reveal the Korok.