Characters can learn more about the place where they have found themselves through their access to the network, or via asking after they arrive at the temple. As long as it is listed on this page, you can assume they have learned these things via their own investigation.
The city of Centre is capable of hosting a population of about half a million, but currently only about 350,000 citizens live there. It contains a large variety of zoned buildings:
The city is built compactly in an area of 47 square miles (124 square kilometers) and includes various sections of greenspace. The region around the city is arid—beyond the bounds of the infrastructure that lies outside the city, it appears to be desert. The city is situated somewhat close to one edge of the segment, allowing people to view the high steel security fence that borders the segment to prevent people from falling off the ring.
There are no bodies of water in or near Centre. Water is supplied via the environmental scrubbers and an elaborate plumbing system. There are trees in the city, with a few large parks, but otherwise, every patch of bare soil is used to grow produce for consumption. Although the replicators are capable of providing all the food a person could need, the taste and texture of all the food created by them is a bit mealy, and this can be offset by preparing the food with fresh fruits and vegetables included.