 To which are attached the smaller suburban towns of IJsselstein and Vianen; the former villages of De Meern and Vleuten, which have been annexed - also formally - by the Utrecht municipality and the western city expansion of Leidsche Rijn; the chained towns of De Bilt and Bilthoven, who are nearly connected to the east side of the city with less than a mile of recreational areas and infrastructure separating both) houses around half a million people.The other 100-200.000 inhabitants making up the entire agglomeration population mostly live in slightly more distant towns such as Zeist, Bunnik, Houten, Breukelen etc.These suburban towns and villages are situated, averagely about four of five miles from the outer districts of Utrecht city.