Icelines

Category:Geopolitics
The Icelines are a maze of tunnels made of ice leading between portals found on the roof of the Nether. They can be used much like a subway system, employing boats instead of trains. These lines are used to travel between communes faster than top speed in the Overworld, due to the fact that 1 block in the Nether is 8 blocks up top. The Icelines are currently still heavily under construction, however they function as intended. 
The Icelines are one of the oldest phenomenon on the server, predating the update to 1.16; making them easily over a year and a half old as of August 2021.
A short explanation on how the Icelines work can be found here on the Minecraft Wiki.
"boat-go-real-fast lines"
- carsen farsen, on the Icelines.