The security ministry said that crews in its aviation arm spent more than 500 hours finding 33 unregistered landing strips in the country.
The implication is that these strips are being used by drug gangs, but some seem to be private strips on farms and ranches.
The Servicio de Vigilancia Aérea spent 587 hours in the air finding these locations, the Ministerio de Seguridad Pública said.
Some 18 strips are in the north Pacific region. Eight are in the south, and seven are in the central Pacific, said the ministry. Some of the strips have been used in the past for agricultural purposes, the ministry said.
The ministry said that a list of strips and their locations will be turned over to Aviación Civil. That agency is supposed to keep track of landing spots.
Two recent crashes of presumed drug planes have raised the interest of law enforcement.