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.
見渡す限り, 目の届く限り
over a very large area; as far as the horizon
:
•
The desert stretched out as far as the eye could see.
砂漠は見渡す限り広がっていた。
•
From the top of the hill, we could see fields of sunflowers as far as the eye could see.
丘の上から、見渡す限りひまわり畑が見えた。