Question: What is the population of the geographical region with a relatively high population density at its core and close economic ties throught the area that is in Lebanon Country, Pennsylvania?
Sentence (from "Environment of Belgium"): Biodiversity is lower in Flanders than in Wallonia because of population density and fragmentation of habitats, but efforts are being made to boost bio-diversity through connecting fragmented forests and national parks through wildlife crossing "ecoducts" such as in Kikbeek.
Relevant evidence: No