Karytaina or Karitaina is a village and a community in Arcadia, Greece. Karytaina is situated on a hill on the right bank of the river Alpheios, near its confluence with the Lousios. The village was situatied where the fort is today in Ancient Vrenthi and dates back to the Ancient Greece. During the Crusader conquest ca. 1205, Karytaina became the seat of a barony under the Frankish Principality of Achaea, and the Castle of Karytaina was built in the mid-13th century on a steep rocky outcrop by Baron Geoffrey of Briel. The area returned to Byzantine control in 1320, and came under Ottoman oppression in 1460. After a brief period of Venetian rule (1687–1715), Karytaina returned to Ottoman control, and prospered as an administrative and commercial centre. Karytaina and its inhabitants were among the first to rise up during the Greek War of Independence of 1821–29. Today Karytaina is a protected traditional settlement and has, alongside the remains of its Frankish castle, several other medieval and Ottoman monuments.

Megalopoli is a town in the southwestern part of the regional unit of Arcadia, southern Greece. It is located in the same site as ancient Megalopolis. When it was founded in 371 BC, it was the first large urbanization in rustic Arcadia. Its theater had a capacity of 20,000 visitors, making it one of the largest ancient Greek theaters.