Endless [yī wàng wú jì]

[Explanation] Ji: edge. The horizon is as far as the eye can see. The description is very broad.

[Source] Song Dynasty Qin Guan's "Butterfly Loves Flowers": "A boat is parked under the Xunyang City, and the crows are dim, and the trees are dotted by the clouds. From now on, the nine factions of the river are divided; the smoke is thick and the sky is endless. ."

Example

The Mongolian knights soared like eagles on the prairie of ~.