[TB?] Which trade route?

[trolls' bane]

Sorry this [TB?] is late. I've been having internet trouble.

What is the name of the trade route that Hoth is on?
Hint: 1.

The trade route also includes Bespin, Ison, and Varonat.

2.

It is a detoutr on the Correllian Trade Spine.

3.

Instead of "trade route" or "trade spine," this is called the ____ Corridor.