What is Hadrian's Wall?

Hadrians wall is in the north east of england it stretches 73 miles long and goes from coast to coast. It was put in place to mark the edge of the roman empire in britian.

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.