# The first and innermost major ring, Bulvarnoye Koltso (Boulevard Ring), was built at the former location of the 16th-century city wall around what used to be called Bely Gorod (White Town). The Bulvarnoye Koltso is technically not a ring; it does not form a complete circle, but instead a horseshoe-like arc that begins at the Cathedral of Christ the Savior and ends at the Yauza River.