A map of the city! A simplified version of this is shown in chapter 1 of Reus, but here it is in all it's glory. As you can see, there are 5 branch sections of the city centered around the central zone. Each branch is representative of 1 type of magic and each continent. There is an embassy in each section of the city for its respective continent. Regaia is located on the earth continent of Petra, which is why the earth section is the smallest (don't need an embassy in your own country ;D ).
The central zone is where the main government buildings are located, such as the Mayor's office, The Police Headquarters, and the Registration office. The highest security prison is also located in the central zone.
There is a river that runs from the mountains surrounding Regaia all the way down to the sea, the Irun River. It has many small offshoots that the early settlers of Regaia turned into a series of canals to get around the city.
Here's where I'll post extra stuff related to Reus, be it lore stuff (like maps!) or doodles of the characters. There's a lot of world building that doesn't *need* to be explained in detail, but if you want to know, here's the place to find out ^.^