Here is a closer look at the map the Colonel and crew were using to coordinate their assault on Alabaster. Over on the edge we can see the X's marking the proposed attack route.

The city of Utopia Prime is situated roughly at the center of a large, deep, circular crater in the earth...an area which is called 'The Veil'. Around the upper edges of the steep cliffs appear to be the ruined remains of older cities dotting the landscape. Some of these ruins seem to be the homes of "Eaters", whoever they may be...

Read the whole comic at http://lollipophandbook.com/