for X = -2500, 2500, 512 do

        for Z = -2500, 2500, 512 do

                local P = Instance.new("Part")

                P.Anchored = true

                P.Locked = true

                P.Size = Vector3.new(512,3,512)
                P.CFrame = CFrame.new(X,0,Z)

                P.BrickColor = BrickColor.Green()

                P.Parent = game.Workspace

        end

end