The City Proper, also called the core, is the location of the original Ravnica city. It is divided into ten districts, each of which is a huge urban environment in its own right. The districts are named in simple numerical order from First to Tenth. No correlation exists between the ten guilds and the ten districts; all ten guilds are active in all ten districts. The Tenth District, in particular, is a hotbed of activity where all the guilds maintain their primary headquarters. A huge avenue called the Transguild Promenade runs through all ten districts, making it the most notable landmark for navigation through the city's heart.