Taris is a vast and great city. It is one of the few Mega-Cities that grew after the War of Conquest. Taris is roughly 300 miles in diameter. The city loosely governed by a Council of 13 which in turn is loosely ruled by The 3.
The city is no longer allowed to expand outwards. Its borders are surrounded by many defenses including a wall of death that surrounds the entire city. This stops anyone from leaving except out of a few select locations.