past buffer zones provided a method of diverting from waters into arable fields then due to a lack of living space in the middle of the twentieth century people settled on these fields thereby creating the koto district just as in bangkok in shanghai pumping of groundwater has led to the subsidence for more than one hundred twenty square kilometers in the center of tokyo without. that's. there or you know. that so the current. there ever was here. and now i'm standing on this. this end. there is a risk. so this was cause rather than just. the