So one of the lessons of March 11 seems to be "think beyond what you believe to be the possible."
But there is soteigai, and there is, well, this:
Saitama Pref. to take tsunami countermeasuresOK, so Saitama Prefecture has no coastline, is 20 kilometers upriver from Tokyo Bay and 100 kilometers from the open ocean.
The Yomiuri Shimbun
The Saitama prefectural government has begun work to include tsunami countermeasures in its regional disaster management plan, it has been learned.
This will be the first attempt by an inland prefecture to prepare for tsunami damage in its disaster preparations.
It is part of a review on possible damage after experts examining the impact of the Great East Japan Earthquake said a future tsunami could hit Tokyo Bay and travel up the Arakawa river that runs from Tokyo through Saitama Prefecture. (Link)
I suppose I should look on the bright side. The prefecture investigating its tsunami preparedness at least is not Yamanashi.