Achaea or Achaia (, , ?χα?α) was (and is) the northernmost region of the Peloponnese, occupying the coastal strip north of Arcadia. Its approximate boundaries were to the south the mountain range of Erymanthus, to the south-east the range of Cyllene, to the east Sicyon, and to the west the Larissos river.

1. The Frankish ruler of the Peloponnesos was the Prince of Achaea, with his capital at Andravida in Elis.
   伯羅奔尼撒的法蘭克統(tǒng)治者是亞該亞大公，首都在埃利斯的安德拉費達城。