Dan Piraro's consistently odd Bizarro. Comics that use both prisoners and maps almost always involve the topic of escape.
But this cartoon does remind me of this fantastic story of WWII German POWs escaping from a POW camp near Phoenix. Three of the Germans even made a small boat with which they planned to row down the Salt River to freedom. And here's where the story becomes map-related in the most spectacular way:
It never occurred to the Germans that in dry Arizona a blue line marked “river” on a map might be filled with water only occasionally. The three men with the canoe were disappointed to find the Salt River bed merely a mud bog from recent rains. Not to be discouraged, they carried their canoe pieces twenty miles to the confluence with the Gila river, only to find a series of large puddles. They sat on the river bank, put their heads in their hands and cried out their frustration.
Title of post reference here