as far as the eye can/could see
US /æz fɑr æz ðə aɪ kæn/kʊd siː/
UK /æz fɑr æz ðə aɪ kæn/kʊd siː/

1.
一望无际, 极目远眺
over a very large area; as far as the horizon
:
•
The desert stretched out as far as the eye could see.
沙漠一望无际。
•
From the top of the hill, we could see fields of sunflowers as far as the eye could see.
从山顶望去,向日葵田一望无际。