Yóuzǐ zài wài piāobó duō nián, zuì nánwàng de háishi xiāngguān de shānshuǐ.
After years of wandering far from home, what the traveller can least forget is the hills and rivers of his homeland.
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A purely literary word, best known from 崔颢's 《黄鹤楼》: 日暮乡关何处是?烟波江上使人愁 (Dusk falls: where is my homeland? The mist on the river fills me with sorrow). 关 is a gate or pass, so the word pictures the gates of home. In speech say 家乡 or 老家.