Shoreline is an early mid-game region mainly consisting of vast oceans interspersed with the occasional small island, as well as a network of underground tunnels partially filled with water.
Shoreline consists mostly of open water, islands connected by tunnels, and systems of waterlogged pipes. Aquatic and aerial predators including Salamanders, Vultures and Leviathans make swimming in open water risky. While Jetfish can be aggressive or impede Slugcat's progress, they can also be grabbed and ridden to quickly cross large stretches of water. When following the Yellow Overseer, Slugcat is guided towards the far east of the region.
SPOILER WARNING: LttM This section contains major plot details from the "LttM" region and beyond. If you have not progressed past this region, then read no further!
Looks to the Moon is a small portion of a dilapidated computer complex, and the destination to which the Overseer initially guides the player. Looks to the Moon can be met here. Entering this area isn't necessary for game completion, but is vital to the lore of Rain World and marks the first milestone in the game, after which the Overseer begins giving directions to a new location.
SPOILER WARNING: Downpour This section contains details concerning the Downpour DLC. If you have not yet completed the DLC, then read no further!
In Downpour, the upper rooms of Luna (including the connection with Bitter Aerie) which survived the superstructure's collapse are accessible for every Slugcat except Spearmaster and Artificer. Without entering the Submerged Superstructure, these rooms can only be reached through a vertical pipe above Moon's chamber, but this is impractical for Slugcats lacking the necessary aids or mobility. Otherwise, they must be accessed through the Bitter Aerie subregion of the Submerged Superstructure.
SPOILER WARNING: Downpour This section contains details concerning the Downpour DLC. If you have not yet completed the DLC, then read no further!
The Precipice is an isolated subregion connected to The Exterior. It was once a bridge that connected Five Pebbles and Looks to the Moon, as well as the rest of the Waterfront Facility via a climbable shaft by the time of the Spearmaster, but by the time of the Artificer, the section between said shaft and Looks to the Moon collapsed, before collapsing even further leaving it disconnected from the rest of the Shoreline for all other slugcats and only accessible through the Karma Gate at the far east of the Underhang. The region is not available to Saint.
Shoreline has been renamed to Frigid Coast in Saint's campaign due to significant alterations caused by Five Pebbles' collapse and climate changes. The environment has transformed into a cold and static aquatic ecosystem reminiscent of the Submerged Superstructure. The Precipice no longer exists. The route that once connected to Shaded Citadel has been crushed and replaced by the central Underhang, and consequently now directly connects to Silent Construct. One of the rooms leading to Subterranean (SL_C06) also has a specific barrier removed, making traversal easier.
Shoreline and its past iteration, Waterfront Facility, have the most connections to other regions in the game, at 7. However, Shoreline's gate to Bitter Aerie is one-way and cannot be accessed from Shoreline.
All
Hunter
The Precipice
55 (150)
Monk or 
Survivor when following the 
Yellow Overseer.
Salamanders, 
Vultures and 
Leviathans make swimming in open water risky. While 
Jetfish can be aggressive or impede Slugcat's progress, they can also be grabbed and ridden to quickly cross large stretches of water. When following the 
Gourmand
Rivulet
Saint
Monk-exclusive 
Shelter
Pale Yellow Pearl
Bright Purple Pearl
Bright Magenta Pearl
Saint-exclusive 
Distant Towers upon Cracked Earth
SPOILER WARNING: LttM
Overseer initially guides the player. 
Looks to the Moon can be met here. Entering this area isn't necessary for game completion, but is vital to the lore of Rain World and marks the first milestone in the game, after which the Overseer begins giving directions to a new location.
SPOILER WARNING: Downpour
Luna (including the connection with 
Bitter Aerie) which survived the superstructure's collapse are accessible for every Slugcat except 
Spearmaster and 
Artificer. Without entering the 
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The Exterior. It was once a bridge that connected Five Pebbles and Looks to the Moon, as well as the rest of the 
Waterfront Facility via a climbable shaft by the time of the 
Five Pebbles' collapse and climate changes. The environment has transformed into a cold and static aquatic ecosystem reminiscent of the 
Shaded Citadel has been crushed and replaced by the central 
Silent Construct. One of the rooms leading to 
Subterranean (SL_C06) also has a specific barrier removed, making traversal easier.
Maps
Creatures
Jellyfish 
Sea Leech 
Regions
Shoreline
Scavengers into Shoreline by loading the region while in a Karma Gate room with them. They can then be found in LttM.
Leviathans to eat 
Vultures.
Shoreline and its past iteration, Waterfront Facility, have the most connections to other regions in the game, at 7. However, Shoreline's gate to Bitter Aerie is one-way and cannot be accessed from Shoreline.
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