After that, the entrance area of the Kawachi bay was buried by the earth and sand that had been piled up (making the Tenma-sasu sandbank), and in the era from the second century to the third century, the Kawachi bay was completely separated form Seto Inland Sea, becoming a lake called Kusaka no e (the Kawachi-ko lake).
その後、河内湾の入り口は堆積した土砂で埋まり（天満砂州）、2世紀から3世紀にかけて、河内湾は完全に瀬戸内海から切り離されて草香江と呼ばれる湖となった（河内湖）。