"rugged ground" is a correct and usable phrase in written English.
You can use it to describe a terrain that is difficult or challenging to traverse. For example, "The terrain quickly changed from gentle paths to rugged ground as I trekked deeper through the forest."
6 Flinging off their jewelry with trembling hands and with their hair flying, they fled for their lives over rugged ground and, collecting into groups, they p219 called to help them those who were themselves in need of help from others.
Importantly, spatio-temporal characteristics of IS are subject to different kinds of plasma instabilities which may or may not be present in the radar's field-of-view, in contrast to the regular ground scatter (GS) echoes, which represent radio waves "reflected" by the regular ionospheric layer before they are scattered back by the rugged ground surface.
Though we had passed over not less than four-and-twenty miles of very rugged ground, and had a Highland dance on the top of Dùn Can, the highest mountain in the island, we returned in the evening not at all fatigued, and piqued ourselves at not being outdone at the nightly ball by our less active friends, who had remained at home.
With its rugged grounds, a combination of steep mountains covered in dense foliage, positioning troops is exceptionally hard.
In the Cph1Δ Pfr state, which has a low quantum yield, the need for two GSI populations in the target model suggests a rugged ground-state potential energy surface and raises the possibility of unproductive depopulation of the excited state to generate GSI species.
The area consisted of "very difficult and broken ground" in a rugged area of the Judean Hills.
His response to frippery like gazebos isn't surprising, given his rugged training grounds.
His age was no hindrance to him, for with perpetual exercise it was both strong and active; but being weakened with sickness, and tired with his long journey, his horse stumbling, he fell encumbered with his arms, and faint, upon a hard and rugged piece of ground.
But this is a coastline whose mystique goes way beyond cine-tourism; it's a place of looming purple mountains topped with snow and grey-tinged landscapes hiding Viking burial grounds, rugged cod fishing communities and legends of trolls.
Additional new sites in rugged terrain still require ground verification.
He became a powerful and often controversial full-forward, and some of his rugged exchanges on the ground led to Tribunal suspensions.
