'Suburb' in the Bible

'Command the sons of Israel, and they have given to the Levites of the inheritance of their possession cities to inhabit; also a suburb for the cities round about them ye do give to the Levites.

The cities shall be theirs to live in; and their pasture lands shall be for their cattle and for their herds and for all their livestock.

You shall also measure outside the city on the east, south, west, and north sides two thousand cubits (3,000 ft.), with the city in the center. This shall belong to the Levites as pasture lands for the cities.

So you shall give to the Levites forty-eight cities in all, together with their pasture lands.