What is going on with geography?

I'm reading through for the second time, and am getting confused with how geography is set up. Is it just me, or did SK make some mistakes?

In The Drawing of the Three, Roland is at the Western Sea and needs to head north. He keeps the sea to his right and the mountains to his left.

In The Wastelands, Blaine tells the Gunslingers that their course will run 7000 miles southwest, but they just came from the Western Sea, so is the Western Sea actually a misnomer, and it's in the east?