西城以北爱人归东城以南恋人归
[xī chéng yĭ bĕi ài rén guī dōng chéng yĭ nán liàn rén guī]
It's poetic and has deep sentiment. Translated loosely, it can be 'In the north beyond West City where lovers reunite and the south beyond East City where sweethearts return.' It may refer to the coming together or meeting of loved ones in these different locations which hold emotional significance.