Moscow

The following fortifications served as the city's circular defense boundaries at some point in history: the Kremlin walls, Zemlyanoy Gorod (earthwork town), the Kamer-Kollezhsky Rampart, the Garden Ring, and the small railway ring. The Moscow Automobile Ring Road (MKAD) has been Moscow's boundary since 1960. Also in the form of a circle are the main Moscow subway line, the Ring Line, and the so-called Third Automobile Ring, which was completed in 2005. Hence, the characteristic radial-circle planning continues to define Moscow's further development. However, contemporary Moscow has also engulfed a number of territories outside the MKAD, such as Solntsevo, Butovo, and the town of Zelenograd.
All administrative okrugs and districts have their own coats of arms and flags as well as the head officials.
In addition to the districts, there are Territorial Units with Special Status. These usually include areas with small or no permanent populations, such as the case with the All-Russia Exhibition Center, the Botanical Garden, large parks, and industrial zones. In recent years, some territories have been merged with different districts. There are no ethnic-specific regions in Moscow, as in the Chinatowns that exist in some North American and East Asian cities. And although districts are not designated by income, as with most cities, those areas that are closer to the city center, metro stations or green zones are considered more prestigious.
Moscow also hosts some of the government bodies of Moscow Oblast, although the city itself is administratively separate from the oblast.