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This is a relatively large lake with a few other locations on its shoreline, such as the Poseidon Reservoir to the northwest, Natick Banks including its police department to the west, an unmarked pre-War military checkpoint to the southwest and the Mass Fusion disposal site to the southeast. Several unmarked shacks can be found along the northeastern shoreline, guarded by mirelurks and raiders. The lake bed itself has a lot of trash in it, including some radioactive barrels and an industrial chest. Lake Cochituate's southern shore hugs the outskirts of the Glowing Sea and provides the shortest route to the federal supply cache 84NE.
- Robot parts model - In one of the shacks near the north-east end of the lake.
- Power armor frame with some random power armor parts on it depending on the player's level at an unmarked military checkpoint due south of the Natick Police Department and directly west of the Mass Fusion disposal site.
Lake Cochituate only appears in Fallout 4.