The present Mizuhai district lies inland, but in ancient time, this area was covered with sprawling rice pads and swamps, many rivers such as the former tributary of the Yamato River and River Neyagawa, and lakes and ponds such as Fukonoike Pond.
また、現在の水走は内陸部にあるが、古来、この地まで深田や沼地が続き、旧大和川の支流や寝屋川など多くの河川や深野池などの湖沼や河川があった。