"To map an area" means creating a visual representation or drawing of a specific place, showing its features, such as roads, buildings, and landmarks, in a clear and organized way. Full definition
On top of this, each of mapped areas of the game are tailored in a way that you'll eventually find the way out even If you're lost. (16bitdad.com)
Seriously, it's apparently larger than the original game's map area in size. (thedgcast.com)
There were also new map areas, item pick - ups, and new interactive world elements, each crafted to encourage and reward thorough exploration. (gamesauce.biz)