Wakae Island, or Wakaejima (和賀江島, Wakae-jima) is an artificial island, the oldest in Japan, now in ruins. The name means "Waka Bay Island" from Waka, Zaimokuza's old name (see the text of the commemorative stele, below). Its remains are located at the east end of Zaimokuza Beach near Kamakura and are still visible at low tide. It was built in 1232 and, in spite of its state of disrepair, it has been declared a national Historic Site because it is the sole surviving example of an artificial harbor from the Kamakura period.