The locations in Game of Thrones are sprawling, well-detailed regions that fans feel like they come to know, especially after they were visualized in the HBO series.
A fan-made interactive map has given us all the information and details we could have hoped for. Author George R.R. Martin provides a rough map at the beginning of the novels, but they echo a medieval cartography approximation rather than accurate detailed pictures.
The digital map can be zoomed in on and scrolled through, providing you a way better look at the world than most other maps. The show's intro take viewers flying through important locales, but it's hard to really tell where one place is in relation to others.
That's the best thing about this map--you can look at routes between cities and landmarks, tracking how far characters traveled on certain journeys, and see where one seat of power is in relation to another. Clicking a location will bring you to its A Song of Ice and Fire Wiki page, as well.
On a related note, a large benefit of this particular map involves specific tracking: you can select any segment from the book and tag characters to see where they are at that point in time. If you haven't read the books, there are obviously spoilers to be found here by going too far ahead for a character. It informs you when their journey ends if you have them selected, so try not to ruin anything for yourself!
The distances, as the top right corner explains, are estimated based on the books' statement that The Wall is 300 miles long. Everything is based on that number, though the map notes that the odds that it's exactly 300 miles are pretty small, which would cause their measurements to be off over large distances. Still, this is the most detailed and accurate map you're likely to find--enjoy looking around Westeros and beyond.