What is the name of a shipping lane with markings for the safe passage of ships?

Player #53553731, they are a channel where I come from.

Julia, Channels, Shipping lanes, and Draft, or Draught, channels! Some such channels can coexist in a waterway, and can be defined to establish "proper" shipping lanes by boat type, size, and keel draught/depth and loading weight!

Never had i try boarding in a ship