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, Leviathans, and Vultures 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, or navigate underwater tunnels that would otherwise cause Slugcat to drown. 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) that survived the superstructure's collapse are accessible for every Slugcat except Spearmaster and Artificer. These rooms can be accessed through a hidden 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. During the time of Spearmaster, it was a bridge that connected Five Pebbles and Looks to the Moon, as well as the rest of Waterfront Facility via a climbable shaft. By the time of Artificer, the section between said shaft and Looks to the Moon collapsed. It then collapsed even further, leaving it disconnected from the rest of 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
Monk or 
Survivor when following the 
Yellow Overseer.
Salamanders, 
Leviathans, and 
Vultures 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, or navigate underwater tunnels that would otherwise cause Slugcat to drown. 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
SL_H03
SL_A11
SL_A02
SL_E01
SL_H02
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) that survived the superstructure's collapse are accessible for every Slugcat except 
Spearmaster and 
Artificer. These rooms can be accessed through a hidden 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.
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SL_H03
SL_I01
SL_A15
The Exterior. During the time of 
Waterfront Facility via a climbable shaft. By the time of 
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 may eat 
Vultures due to both existing in Shoreline.
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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