Coimbra ancient Door's archway in the Walls of the city, the city is divided into two areas. The 'baixa,' lower part of town houses the cities commercial zones. The 'alta,' upper part of Coimbra is much older and must be entered through a break in the city wall, named the Arco de Almedina. This archway was created during Arab occupation and is aptly named medina which means "city" in Arabic- Portugal