In an attempt to ease the pain, We put together an incredibly detailed, interactive map for those looking to get a better understanding of the known world.
The map, which can be found here, Focus on one particular area, like Dorne, or look at the sheer size of the entire world. 
In an effort to be as spoiler-free as possible, the map also includes notes on cities that are more heavily explored in later seasons or haven’t been explored at all.