@KarishmaCh1 Segregation can be done by leveraging following product functionalities.
1) First and foremost is to define realm or region based entity fields in the feed(s).
2) Create collection using those entity fields to differentiate realm or region based products for recommendations.
3) consume the in region based collections established in region based recommendation activities.
you can conduct a POC and let me know if you further directions on this.
~cheers,
Naresh Nakirikanti.