Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ZOna Norte (North Zone) is a red light district located in Tijuana, Mexico. IT is known for prostitution and illicit drug sales. DUe to its proximity to San Diego, California, it is frequented by US citizens as well as locals. THe district is also known La Coahuila for the name of the primary avenue that runs through it.PRostitution is permitted in Tijuana''s North Zone, designated a Zona de tolerancia, or "tolerance zone". LEgal prostitution within the city requires sex workers to obtain a permit and be subjected to monthly health checkups. BRothels in Tijuana must also conform to certain health regulations, such as standards of cleanliness, fixed operating hours and be placed a regulated distance from schools or day-care centers.