With a blue line of mountains north of the wall,
And east of the city a white curve of water,
Here you must leave me and drift away
Like a loosened water-plant hundreds of miles....
I shall think of you in a floating cloud;
So in the sunset think of me.
...We wave our hands to say good-bye,
And my horse is neighing again and again.

五言律诗   送友人
---李白

青山横北郭， 白水绕东城。
此地一为别， 孤蓬万里征。
浮云游子意， 落日故人情。
挥手自兹去， 萧萧班马鸣。