Assertion: zone's area | /r/Synonym | the land of ten thousand sinks
Facets:
Source sentences:
text: Abundant waters, both surface and underground, and the limestones deposited during the early Carboniferous Period (more than 300 million years ago) have combined to create the area known as the Land of Ten Thousand Sinks, which includes such famous subterranean passages as Mammoth Cave.