and (mostly) aligns with the borders of deeply muslim countries (i.e., theres NO indication of usage in Saudia Arabia, Iraq, etc.) This later fact could also be linked internet access to the site.
Malfideleco has only included users from 30 or so countries in their map. They are having difficulties in geocoding, and therefore they have temporarily excluded the other countries.
Other sources talk about tens of thousands of users in the Middle East, including Saudi Arabia and the United Arab Emirates. Some of these users were LGBT, and they face almost certain death penalty now.
An example here:
The French leak monitoring firm CybelAngel said it counted 1,200 email addresses in the data dump with the .sa suffix, suggesting users were connected to Saudi Arabia, where adultery is punishable by death.
One wrote online under the title 'I May Get Stoned to Death for Gay Sex and wrote: 'I am from a country where homosexuality carries the death penalty.
'I BEG you all to spread this message. Perhaps the hackers will take notice of it, and then, I can tell them to (at the very least) exercise discretion in their information dump (i.e. leave the single gay arab guy out of it). As of now, I plan on leaving the Kingdom and never returning once I have the $ for a plane ticket. Though I have no place to go, no real friends, and no job.'
http://www.dailymail.co.uk/news/article-3204408/Millions-suspicious-spouses-crash-websites-set-names-Ashley-Madison-cheaters-interactive-map-reveals-men-women-registered-adultery-website-live.html