UFO Sightings Map:

“UFO Map: Spain & Portugal”, 
By Larry Hatch

(*U* UFO DATABASE, U.S.A.)

Source: Internet Archive, San Francisco, California

The UFO sightings are divided into arbitrary eras by colours, according to Larry Hatch:

http://www.web.archive.org/web/20060704225158/http://www.larryhatch.net/SPNPT.html

Quote from the article:

“The most recent era (1980 to present in green) shows a loose 
grouping in NW Spain.”

UFO Map: Spain & Portugal
(text by larryhatch.net) (larryhatch.net/archive.org image)