Assertion: urban area's population | /r/HasProperty | 3,900/sq mi
Facets:
Source sentences:
text: The extended area known as the London Metropolitan Region or the London Metropolitan Agglomeration, comprises a total area of 8,382 square kilometres (3,236 sq mi) has a population of 13,709,000 and a population density of 1,510 inhabitants per square kilometre (3,900/sq mi).