Kazusa province

Kazusa (上総国; -no kuni) was an old province in the area of the Boso Peninsula of Honshu that is today the central part of Chiba prefecture. Kazusa bordered on Awa and Shimo-Usa Provinces.

Kazusa was usually run from a castle town at Otaki, although the ancient capital was likely located near Ichihara, across the peninsula.