Mexico City's 350 colonias (neighbourhoods) sprawl across the ancient bed of Lago de Texcoco and beyond. The vast urban expanse is daunting at first, but the main areas of interest to visitors are easily accessible. The historic heart of the city, El Zócalo and its surrounding neighbourhoods are known as the centro histórico (historic centre) and are full of notable old buildings and interesting museums. At last count, the population stood at 22 million and the area of the city is around 5,000km2. Altitude is relatively high and you may need to adjust for the first couple of days by drinking lots of water and resting often. It can get cold at night during winter.
Most tourist attractions are concentrated in certain parts of the city, making getting around fairly straight forward. Buses are cheap and plentiful but can be crowded and hot. The metro is modern and efficient, but can also get crowded. Neither should be taken at night; take a taxi instead and be sure to order one, not hail one down off the street.
Detailed maps of Mexico City can be found on the following websites:
All About Mexico City
Contains numerous printable maps of the city, including a subway map.
http://www.allaboutmexicocity.com/
Multimap
Leading supplier of maps, with an excellent zoom map of Mexico City.
http://www.multimap.com
Perry Castaneda Map Collection
A collection of different maps of Mexico.
http://www.lib.utexas.edu/maps/mexico.html

More topics on this site…
Mexico City travel tips
Mexico travel information
Mexico travel tips
Mexico health and safety
Mexico maps and geography
Essentials
Visas: Stays longer than 72 hours require a tourist card valid for 180 days.
Season: Enjoyable year round, October to May is the most pleasant time to visit.
Money: Peso – ATMs widely available, US dollars also accepted
Language: Spanish – English understood in tourist areas
Emergency #: Ambulance: 060