Nansoga (Southern Sung painting) is an idea which was created from the name of a Zen school by a theorist who lived in the Ming dynasty during the 17th century, and it has nothing to do with geographical north and south.
南宗画は17世紀に明末の理論家によって、禅の流派名から作られた概念で、地理的な南北とは関係がない。