expression, noun
out of sight; out of eyeshot
Refers to a place where one cannot see or keep an eye on something; often used in warnings about leaving things unattended.
貴重品を目の届かないところに置かないでください。
Please do not leave valuables out of sight.
子どもを目の届かないところで遊ばせてはいけません。
You must not let children play where you can't see them.
The opposite: a place within sight or reach of one's attention.
Phrase composed of 目 (eye), 届かない (negative of 届く, to reach), and ところ (place), literally 'a place where the eyes do not reach'.