The Canals are a network of rivers and drainage tunnels, located in City 17 and the Wasteland. After the Combine occupation, they began serving as an escape route for refugees trying to leave City 17 on foot.
The canals near and in City 17, connecting the urban center to a river system and dam where its water supply is pumped, appear to be heavily used as drainage, and have a very large network of sewers and waste tunnels. Because of the Combine's invasion and subsequent drainage of Earth's resources, the canals near the city have almost all emptied out, with the riverbed and a large amount of waste remaining. The network is infested with Xen wildlife, and constantly shelled by the Combine.
Outside City 17, the tunnels and sewers give way to rivers and waterways, which are used for transportation rather than drainage and waste disposal, as shown by the many shipwrecks along the larger tunnels. The water levels, however, are low, and following the Combine invasion, a large portion of the canals in both the City and outside have become flooded with toxic waste or other hazardous materials.
 Resistance presence
The Resistance established an organised system of stations, living areas and bases, using the many tunnels and drainage areas both in the canals inside and outside the City, for refugees hoping to escape Combine oppression. Through the use of radios and hidden bases containing supplies and living quarters, humans and Vortigaunts formed a fairly strong foothold in the canal areas.
 Major locations
 Captioned map
Partial in-game map of the Canals, rather close to the in-game layout, with notable points added in visit order. Found in the Resistance point where the Airboat gun is provided, it includes only the section between that particular point and Black Mesa East.
 Station 1
The first underground railroad base encountered by Gordon Freeman during his trek through the sewers. It was raided by Civil Protection shortly before Gordon's arrival, and the rebels stationing there were executed.
A Metrocop killing Rebels with an Emplacement Gun.
 Station 6
An underground railroad base located at the end of the canals, just outside City 17. It housed the Airboat that Gordon Freeman used to travel to Black Mesa East. The station is shelled soon after Gordon's arrival, with all of the rebels stationed there having been killed or turned into Zombies.
 Station 7
A Resistance Underground Railroad station located at the end of the Wasteland part of the Canals leading out of City 17. Located on a bank of the Canals, Station 7 was used by the Resistance as a refugee aid station before the destruction of City 17.
 APC garage
A Combine garage located in the Wasteland section of the Canals, used for the maintenance of Armored Personnel Carriers. It is visited by Gordon Freeman during his journey to Black Mesa East.
 Gate 5
A Combine outpost located in the Canals. It is visited by Gordon Freeman during his journey to Black Mesa East.
 Black Mesa East
A Resistance base located at the Wasteland end of the Canals outside of City 17, opposite to a dam, its generating station and its reservoir, and right next to the abandoned mining town of Ravenholm. Black Mesa East is where Doctor Eli Vance, Doctor Judith Mossman, Alyx Vance, and many other Resistance members, including several Vortigaunts, used to live before its destruction.
With the arrival of Gordon Freeman, Civil Protection was fully aware of the presence of Resistance refugee stations, and were conducting raids on them. Eventually all the bases were either found and destroyed, or were closed down and abandoned. Freeman did however destroy almost all of the Civil Protection's outposts on his way to Black Mesa East.
 Related Achievements
|Anchor's Aweigh! (5G)|
|Get the Airboat.|
|Heavy Weapons (5G)|
|Get the Airboat's mounted gun.|
|Destroy the Hunter-Chopper.|
|Discover the hidden singing Vortigaunt cave in chapter Water Hazard.|
|Half-Life 2 (cut)|
|Float five seconds in the air with the Airboat.|
 Behind the scenes
- The levels were also to be much longer and allow the player a deeper view of the Wasteland part of the Canals.
Homeless citizens under the bridge in the same map.
An early City 17 street with a canal in the middle.
One of the numerous chambers in the Half-Life 2 leak canals.
Razor Train passing by a canal and residential apartments.
Barnacle lying in wait for its prey near a Medkit.
 List of appearances
- Half-Life 2 - E3 2004 Teaser Trailer (First appearance) (Non-canonical appearance)
- Half-Life 2 - E3 2004 Trailer (Non-canonical appearance)
- Half-Life 2
- Half-Life 2: Raising the Bar
- Half-Life 2: Deathmatch (Non-canonical appearance)
 See also
- Half-Life 2 original storyline#Sewers / Canals
- Half-Life 2 original storyline#The Wild - The Wasteland - The Scrapland
- "c17_outside", a fixed map of the leak Canals (based on "canals_01_15"; requires Episode Two)
|Half-Life 2 story arc journey||Succeeded by|
|Half-Life 2 original storyline||Succeeded by|