一都一道二府四十三県
いっといちどうにふよんじゅうさんけん
one metropolis (Tokyo), one "circuit" (Hokkaido), two urban prefectures (Osaka and Kyoto) and 43 prefectures proper
三府 is read as さんぷ (sampu) and means three metropolitan prefectures (Tokyo, Kyoto, and Osaka).
さんぷ
sampu
いっといちどうにふよんじゅうさんけん
one metropolis (Tokyo), one "circuit" (Hokkaido), two urban prefectures (Osaka and Kyoto) and 43 prefectures proper