The entrance to Reservoir Lakefront Cavern is in the northeast part of East Reservoir Lake, beneath Shatterback Point.

Cave Location

Reservoir Lakefront Cavern can be entered from the water at 3810, 0424, 0210, in the northeast part of East Reservoir Lake, beneath Shatterback Point.

Cave Features

You will need to enter this cave for the quest The Blue Stone.

You can use the wooden boards and Zonai devices in the northwest part of East Reservoir Lake to make a raft to enter this cave. You will need a raft to transport a blue stone for the quest.

After you get past the water, there are Bright-Eyed Crabs and Brightbloom Seeds. There is a vine-covered tunnel to the east that you can cut through to find the cave's Bubbulfrog. The room with the Bubbulfrog also contains a rare ore deposit.

Southeast of the main room, there is an area with some blue stones on the wall and six small blue stones on the floor. For the quest, you need to have a raft. You only need one stone, so take one and attach it to your raft, then turn the raft around and steer it back to Ledo, marked by the quest objective on the map.