each major street was separated by an area of roughly 532m , and those surrounded areas (known as bo ) were divided by mud walls and ditches , which were then divided into towns by three streets running down from north to south and east to west . 各大通りの間隔は約532m、大通りで囲まれた部分(坊)は、堀と築地(ついじ)によって区画され、さらにその中を、東西・南北に3つの道で区切って町とした。