In 1512 Soun HOJO established the Tamanawa-jo Castle in today's Ofuna, Kamakura City as a branch castle of the Odawara-jo Castle, but this area was no longer Kamakura territory during the medieval period.
永正9年（1512年）には北条早雲が現在の鎌倉市大船に小田原城の支城である玉縄城を築くが、ここはもはや中世の鎌倉の境域ではない。