stronghold/ˈstrɑːŋˌhoʊld/noun pluralstrongholds
pluralstrongholds
Britannica Dictionary definition of STRONGHOLD
[count]
1 :an area where most people have the same beliefs, values, etc.:an area dominated by a particular group 2 :a protected place where the members of a military group stay and can defend themselves against attacks 3 :an area where a particular type of uncommon animal can still be found