Proastio (Greek: Προάστιο or Προάστειο, meaning "suburb"; before 1928 it was named Bozaitika, Μποζαΐτικα in Greek) is a neighbourhood in the northern part of the city of Patras, 6 km from the city centre. The Greek National Road 8 (Corinth - Patras) and the OSE Corinth - Patras railway line pass through the neighbourhood. The river Charadros flows 1 km north. The municipal boundary with Rio is also to the north.