also: しゅうざかい
noun
state boundary; provincial border
Refers to the border between states or provinces, especially in countries with a federal system like the US, or historical provinces in Japan.
カリフォルニアとネバダの州境には標識がある。
There is a sign at the state line between California and Nevada.
この川が州境になっている。
This river forms the state boundary.
Compound of 州 (state/province) and 境 (boundary). The reading しゅうきょう uses on'yomi for both characters; しゅうざかい mixes on'yomi and kun'yomi.