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Pennsylvania, Delaware, Virginia and West Virginia are the only states that have a common border with Maryland. The District of Columbia also has a common border and a population of about 592,000 which is about 60,000 more people than Wyoming has but it is not a US State.
Yes, they share a common border.
A region
caves and beaches
a region.
grassland
The Pfalz and Palatine are the two regions that are named because of the physical features that are common to the group of state.
The physical features that many cities have in common include flat lands with many buildings. The roads are paved and there are less plants and trees around.
Common physical features to all environments are air ,water, rock formations water bodies ,trees ,plants ,grass , bushes and things like that.
Mountains I guess?
a region
cool