limitless expanse of clouds and smoke
A yojijukugo describing a vast, boundless scene of clouds and mist, often used in literary or poetic contexts to evoke a sense of infinite distance.
Looking out from the mountaintop, a limitless expanse of clouds and mist stretched before us.
A yojijukugo composed of 雲 (cloud), 煙 (smoke/mist), 万 (ten thousand/myriad), and 里 (an old unit of distance, about 3.9 km), literally meaning 'clouds and mist for ten thousand leagues'. The exact origin is uncertain, but it follows a common pattern in classical Chinese-influenced Japanese for expressing vastness.