heart‧land /ˈhɑːtlənd $ ˈhɑːrt-/ noun [countable]

1. the heartland the central part of a country or area of land

2. the most important part of a country or area for a particular activity, or the part where a political group has most support:
the Democratic heartlands of the Deep South

[TahlilGaran] Dictionary of Contemporary English ▲

heartland
noun
ADJ. agricultural, industrial the industrial heartland of Germany
Conservative, Labour, etc. | traditional
PREP. in a/the ~ The party has lost seats in its traditional heartland of southern Thailand.

[TahlilGaran] Collocations Dictionary ▲