[1] One of the three artificial island districts that was the subject of the "Technoport Osaka"[2] plan formulated in 1988 with the aim of developing a new city center.

Administratively, it belongs to Konohana-ku, and two district names, Hokkoryokuchi and Hokkoshiratsu, are set.

The development plan for the coastal area, which began to be considered in 1983 as a project to commemorate the 100th anniversary of the Osaka municipal organization (1989 is the 100th anniversary of the municipal organization), was formulated as the "Technoport Osaka"[2] concept.

In this concept, it was planned to develop cultural recreation facilities in the northern Kohoku district and achieve a scale of 10,000 employees and 22,000 daytime population in 2010.

[3] In 1991, the nickname "Maishima" was established by open recruitment (Sakishima and Yumeshima are also named at the same time).