The secondary, or "Ni-no-maru" bailey extended in the direction of Osaka Bay, and also had tall stone walls protecting against attack from sea. Smaller enclosures surrounded by water moats protected these two main enclosures, which were connected by a narrow path, such that the castle had an "H" configuration, The total area of the castle was roughly 500 square meters, which was relatively small in relation to the size of its tenshu and its strategic importance.
The secondary bailey, known as "Ni-no-maru," extended towards Osaka Bay and had tall stone walls for defense against sea attacks. Smaller enclosures surrounded by water moats protected these two main areas, which were connected by a narrow passageway, forming an "H" shape. The castle's total area was approximately 500 square meters, which was relatively small compared to its tenshu (main tower) and strategic significance.