Numbers 35:4-5

Which suburbs shall reach from the walls of the cities outward, a thousand paces on every side:

Toward the east shall be two thousand cubits: and toward the south in like manner shall be two thousand cubits: toward the sea also, which looketh to the west, shall be the same extent: and the north side shall be bounded with the like limits. And the cities shall be in the midst, and the suburbs without.