Leaving Gaomiaozi, they walked towards the floodplain.是什么意思？

Leaving Gaomiaozi, they walked towards the floodplain.

他们出了高庙子小镇,走向湟水河滩.

leaving

n. 离开；v. 离开( leave的现在分词 )，遗弃，忘了带，交托；

例句
The sun has already set, leaving the sky afire with orange and green light.
太阳已经落山，但天空中还映照着如火般橙绿相间的余晖。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

walked

v. 走，步行，散步( walk的过去式和过去分词 )，（鬼魂）出现，陪伴…走，徒步旅

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

towards

prep. 朝，向，对于，接近，为了；

例句
...absent fathers who fail to pay towards the costs of looking after their children.
那些不在子女身边、未能支付抚养费的父亲

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

floodplain

n. 泛滥平原，涝原，漫滩；

例句
Plant located in the Funiu Mountain Yumaidonglu and the south - floodplain reservoirs, Yishanbangshui and attractive landscape.
厂区座落于伏牛山余脉东麓,南临 石漫滩 水库, 依山傍水,风景宜人.