Sector 7 (七番街, Nanaban-gai) is one of the eight sectors of Midgar in Final Fantasy VII. It also appears in some form in On the Way to a Smile: Episode Denzel, Final Fantasy VII: Advent Children, and Dirge of Cerberus Final Fantasy VII.
The Sector 7 slums is the first town visited by the party after the attack on the Sector 1 Reactor, and is AVALANCHE’s home base and an unrevisitable location. The most prominent location is Tifa Lockhart’s 7th Heaven bar. Denzel was born on Sector 7 Plate. Like every sector, it exists as both part of the slums and part of the plate. Only the slums section is ever shown in any Compilation of Final Fantasy VII media. (Source : http://finalfantasy.wikia.com/wiki/Sector_7)