Rosario lies on the ravine of the right-hand shore of the Paraná, about above mean sea level, in a place with a natural slope to the low shore. The point of origin of the city is "Plaza 25 de Mayo" ("May 25 Square"), now surrounded by the municipality ("Palacio de los Leones"), the Basilica Cathedral of Our Lady of the Rosary, the Central Post Office, the Decorative Art Museum and a building called "La Bola de Nieve" ("The Snowball"). Between the Cathedral and the municipal building is "Pasaje Juramento" ("Oath Passage"), leading to the Flag Memorial. The streets mostly follow a regular checkerboard pattern.