Matsushiro Castle
 , formerly known as Kaizu Castle ( 海津城 , "Kaizu-jō" ) , is a Japanese castle located in former Matsushiro town , now part of the city of Nagano , northern Nagano Prefecture , Japan . 
<triplet> Japanese castle <subj> Japan <obj> country <triplet> Nagano <subj> Nagano Prefecture <obj> located in the administrative territorial entity <subj> Japan <obj> country <triplet> Nagano Prefecture <subj> Nagano <obj> contains administrative territorial entity <subj> Japan <obj> country <triplet> Japan <subj> Nagano Prefecture <obj> contains administrative territorial entity