Orange Town is city in the East Blue where Luffy first clashed with Captain Buggy and met his current navigator, Nami.
The large, mostly-peaceful city that resides upon a small island in East Blue, Orange Town is where both Monkey D. Luffy and Roronoa Zoro came across the wicked scheme of the Buggy Pirates, who sought to strong-arm the town and it's inhabitants into doing what their captain Buggy the Clown wanted. It is also the place where Monkey D. Luffy comes across Nami, a treasure-loving navigator/thief who decides to team up with the Straw Hat Pirates on their adventures.
Orange Town was originally created by Eiichiro Oda for use within the One Piece manga, and the reason for it's creation is not fully known. Orange Town first appears in One Piece: Volume One and in One PIece #4.