Undertow Spillway

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Undertow Spillway

Undertow Spillway

Added in Drizzle Season 2022 (1.1.0)
Total area 2,527p
Features Inkrails(RM), Sponges
Hazards Abyss
For the song performed by Wet Floor, see Undertow.

Undertow Spillway is a multiplayer stage in Splatoon 3. It is also one of the stages that can have Tricolor Turf Wars.


Overhead view of Undertow Spillway

Undertow Spillway is an abandoned underground flood bypass in Splatsville that was renovated into a Turf War stage. The spawn area features a wide area of turf that goes far to the right. The first drop is accessible to the other team via an uninkable ramp and goes also as far as the spawn area. The drop after that is an open area and to the left allows access to a raised area and an uninkable raised area. To the right of the open area is a small drop to another open area. The middle is two open areas separated by a wall in the middle.

Ranked Battle terrain

In Ranked Battles, specifications for the terrain or placement of objects are different between the modes; these changes create new paths or new objects to take cover behind.

Splat Zones

There are two Splat Zones, both located underneath the glass areas. An uninkable ramp is added to allow access to the opposing team's base.

Tower Control

The Tower starts in the middle of the stage, replacing the Bumper normally there. When advancing, the Tower goes left then straight, closer to the opposing team's side. It then goes right and continues going until it reaches the goal. The large glass areas in the middle are removed and a ramp is added in the middle of the opposing team's base.

In Splatoon 3, checkpoints have been added:
Checkpoint Location Timer (Seconds) Progress Amount
Before After Total
1 The first checkpoint is just before it turns left, right next to the starting position. 5 96 86 10
2 The second checkpoint is in the middle of the upper left area. 6 59 47 12
3 The third checkpoint is located in the upper middle area. 6 24 12 12


The Rainmaker is located in the middle of the stage, replacing the Bumper normally there. The checkpoints are located in the open area to the right, and to the far left on the opponent's raised area. A ramp is added to the far left to allow access to the checkpoint. The pedestal is located on the first drop. The right of the spawn areas has been altered slightly, having an uninkable path being the only way to get to the pedestal. An Inkrail is added to the far right of the spawn.

Clam Blitz

The Clam basket is located to the left of the spawn, two drops down. An uninkable ramp has been added just behind the basket to help access the platform behind it.

Splatoon 3

Version 1.0.0 to 7.1.0

Undertow Spillway was released with the launch of Splatoon 3.

Version 7.2.0 onwards

The image released on social media announcing changes to Undertow Spillway.
An important message from the Undertow Spillway maintenance team:
"Undertow Spillway will be closed from 4/15 at 5pm to 4/17 at 7pm for inspections and expansion work. For safety reasons, access will be closed during this period so we appreciate your patience."

Undertow Spillway underwent a major renovation in Version 7.2.0.

Changes include:

  • A small amount of the left spawn area has been extended.
  • A ramp was added in the perch area. The sponge and the cover to the right of that area has been extended upward.
  • An uninkable glass has been added below the ledge of the right drop area.
  • Few railings has been added near the snipe area.
  • A tunnel was added below of the snipe area.
  • A chunk of the central wall that divides the center has been removed.


Undertow Spillway was available in the following Splatfests as a Tricolor Turf War stage in Splatoon 3:

Big Run

Undertow Spillway is where the third Big Run took place. Its layout adds many inkable blocks, plus ten Gushers which the Salmonids use to enter the stage. Six Gushers are active at low tide, three at medium tide, and two at high tide. As usual, there are three tides; low tide takes place in the middle of the stage with the Egg Basket placed on the sloped ledge in the center, medium tide sets players on the raised area just outside of Team Alpha's spawn, and high tide sets players in the spawn area with the majority of the stage flooded. For this Big Run only, the Egg Basket's hitbox is expanded downward due to its placement on raised platforms across all tides. The only Known Occurrences that can occur on this stage are Fog, The Mothership, and Rush.

Version history

Version Adjustments
  • Removed the box on top of the grating in Splat Zones because of an issue where attacks would pass between the box and the terrain despite looking like it blocked attacks from below.
  • Changed some parts of the Turf War mode terrain.
    • Deleted part of the terrain on the left-hand side when looking from the player start areas.
    • Added ramps to allow for invading opponent areas.
  • Fixed an issue where certain walls, when inked by a bomb's explosion, would be inked in locations that differed from the explosion.
  • Fixed an issue where players standing on the glass floor could be damaged from the other side.
  • Fixed an issue in Rainmaker mode where the DON'T RETREAT! warning would be shown at a shorter distance than intended.
  • Fixed an issue in Rainmaker that caused the goal distance to change significantly if you jumped on an enemy sponge of a certain size while holding the Rainmaker.
  • Fixed an issue in Rainmaker mode where a "DON'T RETREAT!" warning would be triggered in some spots even if the team was advancing with the Rainmaker.
  • The terrain in Undertow Spillway has been changed in all modes.


1.1.0 - 1.2.1
2.0.0 - 7.1.0



Undertow Spillway is a former flood bypass located deep under Splatsville. Abandoned for years, it surged in popularity after it was renovated into a stage for Turf War battles!
— @NintendoEurope on Twitter[1]
Squid Research Lab reporting from Undertow Spillway, a former flood bypass that's now used for Turf War battles! This abandoned facility is another shining example of upcycling, as the varied terrain lends itself to strategic and hard-fought skirmishes among Splatsville locals.
— @SplatoonNA on Twitter[2]


Click to view the quotes for Undertow Spillway. View the quotation page.


  • This is the first stage to have different names between both Spanish localizations. Both French localizations have used different names for certain stages since the launch of Splatoon, while both English localizations of Splatoon used the same stage names before all regions started using one localization from Splatoon 2 onward.
  • The stage was the first stage introduced in Splatoon 3 to be used in Tricolor Turf War.
    • It is also the first stage to be used in both Tricolor Turf War and Big Run.
  • This stage strongly resembles Tokyo's Metropolitan Area Outer Underground Discharge Channel, the main chamber of which is often referred to as an "underground temple" or "floodwater cathedral", hence the internal stage name of "Temple".
  • During Big Run, as the players get launched onto the stage, an alarm-like sound can be heard.
    • Additionally, the Grizzco helicopter stays immobile the entire time, unlike in other stages.
  • This was the first Big Run stage to take place indoors. It is also the only Salmon Run stage in any Splatoon game where the time of day does not change to night during a Known Occurrence; instead, the lights on the ceiling dim.

Names in other languages

Language Name Meaning
Japan Japanese マテガイ放水路
mategai hōsuiro
Mategai Flood Bypass[note 1]
Netherlands Dutch Baarsreservoir Perch reservoir
CanadaFrance French Réservoir Rigadelle Common Cockle Reservoir
Germany German Schwertmuschel-Reservoir Razor Clam Reservoir
Italy Italian Cisterna Cernia Grouper Cistern
Russia Russian Приливослив
High tide sink
Mexico Spanish (NOA) Desagüe Navajuela Navajuela Drain[note 2]
Spain Spanish (NOE) Cisterna Navajuela Navajuela Cistern
China Chinese (Simplified) 竹蛏疏洪道
zhúchēng shūhóngdào (Mandarin)
Razor Clam Floodway
Hong Kong Chinese (Traditional) 竹蟶疏洪道
zhúchēng shūhóngdào (Mandarin)
Razor Clam Floodway
South Korea Korean 맛조개 방수로
matjogae bangsuro
Mategai Flood Bypass
Portugal Portuguese Undertow Spillway Undertow Spillway
 Internal Temple[3]

Translation notes

  1. Mategai refers to Gould's razor shell (Solen strictus), a type of mollusk found in Japan that is sometimes used as a dish ingredient.
  2. Navajuela refers to Ensis macha, a type of mollusk found in Peru, Chile, and Argentina.