北城以北深海未眠故城以南思念不安
[bĕi chéng yĭ bĕi shēn hăi wèi mián gù chéng yĭ nán sī niàn bù ān]
'Beyond North City the deep sea can't sleep, south of the Old City missing makes hearts restless'. It is poetic, describing two geographically distant places which cause deep emotions such as nostalgia, unease, and longing.