Synonyms of 'heartland'
If a system or organization is described as a bastion of a particular way of life, it is seen as being important and effective in defending that way of life. Bastion can be used both when you think that this way of life should be ended and when you think it should be defended.
The government tends to see itself as a bastion of common sense.
Thesaurus for heartland from the Collins English Thesaurus
Journalists use heartland or heartlands to refer to the area or region where a particular set of activities or beliefs is most significant .