The fukiage (吹上?, literally "blown clean") is the western area that was made into a firebreak after the great Meireki fire of 1657. The Fukiage is encircled by the Dōkan-bori to the Nishinomaru to the east, the Sakurada-bori to the south, the Hanzō-bori to the west, the Chidorigafuchi to the northwest and the Inui-bori to the north.
Read more about this topic: Edo Castle