N-COUNT
（某活动或信仰占优势的）中心区域，核心地区
Journalists use heartland or heartlands to refer to the area or region where a particular set of activities or beliefs is most significant.
例句
...his six-day bus tour around the industrial heartland of America...
他在美国工业中心区域的大巴6日游
Worst-hit areas were Tory heartlands in London and the South-East.
受影响最严重的是伦敦及英国东南部的保守党核心势力地区。