Commentary for Joshua 17:9

וְיָרַ֣ד הַגְּבוּל֩ נַ֨חַל קָנָ֜ה נֶ֣גְבָּה לַנַּ֗חַל עָרִ֤ים הָאֵ֙לֶּה֙ לְאֶפְרַ֔יִם בְּת֖וֹךְ עָרֵ֣י מְנַשֶּׁ֑ה וּגְב֤וּל מְנַשֶּׁה֙ מִצְּפ֣וֹן לַנַּ֔חַל וַיְהִ֥י תֹצְאֹתָ֖יו הַיָּֽמָּה׃

And the border went down unto the brook of Kanah, southward of the brook, by cities which belonged to Ephraim among the cities of Manasseh; but the border of Manasseh was on the north side of the brook; and the goings out thereof were at the sea:

Rashi on Joshua