Αχαΐας is a regional unit in western Greece, known for its rich history and beautiful landscapes. It is part of the Peloponnese peninsula and features a mix of mountains and coastal areas along the Gulf of Patras. The capital city is Patras, which is the third-largest city in Greece and an important port. The region is famous for its archaeological sites, including ancient Aegium and Dionysus temples. Achaia is also known for its agricultural products, particularly olives and grapes, which contribute to the local economy. The area hosts various cultural events and festivals throughout the year.