population density

This area, which includes the Collserola natural park -- a peri-urban Mediterranean forest of 8,000 hectares, surrounded by urban centres -- has a wild boar population density of between five and fifteen individuals per square kilometre.

In more recent history, population density in cities has gathered pace.

One explanation that's been offered is that Trump just wants to have rallies in highly populated areas because he gets bigger crowds simply because of the population density and he just loves those bigger crowds.

This area of Florida has a relatively low population density.

The affordability, the low population density and the space between homes and properties — often measured in acres — is also enticing for correctional authorities and courts across the state looking to relocate former sex offenders who have been conditionally paroled or recently released.