Shape of the world is one of the biggest innovations we expect in Witcher 3. Producers want to break with the tradition which were half-open location being the separate whole and want to make something like a sandbox. In other words, this time, the world will have totally open structure and you'll be able to go wherever you like even at the beginning of the game. What is more, it's supposed to be one coherent whole without fake borders and loading screens in between the particular areas.
We don't have any numbers concerning the size of the available area. Instead of that, producers compare them to other games. World of Witcher 3 will be forty times bigger than the one in Witcher 2 and about 20% bigger than in the most mentioned sandbox of the recent years, which is The Elder Scrolls V: Skyrim. We got also an information, that taking a ride on your horse from one end to the other end of the map will take about thirty-forty minutes.