“南北”常见的英文表达是 “north and south” 或 “the north and the south”(当需要特指某个区域或语境中强调对比时使用定冠词)。
General reference(一般表述):
The country is divided into north and south by a large river. (一条大河将这个国家分为南北两部分。)
With emphasis on contrast(强调对比时):
The economic development between the north and the south shows significant differences. (南北之间的经济发展存在显著差异。)