cirque

A Roman circus.

Nero exhibited theſe Spectacles in his own Gardens, impiouſly joining to them the Diverſions of the Cirque, and appearing himſelf publicly in the Habit of a Charioteer, ſitting in his Chariot[…].

A curved depression or natural amphitheatre, especially one in a mountainside at the end of a valley.

Whose savage trample thus could pad the dank / Soil to a plash? toads in a poisoned tank, / Or wild cats in a red-hot iron cage— / The fight must so have seemed in that fell cirque.

Of course it's going to be bad whenever the clouds let loose, but up here pussyfooting along the perimeter of toothy cirques and dead drops of anywhere from eighty to three hundred feet, it would be a disaster.

Something in the shape of a circle or ring.

Saturn has supplied to the Greeks and Romans the source of a beautiful personification; they have represented him as Time, […] thus with his scythe is he considered to cut down in endless succession every ripened race of man; and as the serpent is annually renewed by the cast of its skin, so is every falling race of man held to be renewed by a young and succeeding progeny; from hence arose the fiction, that Saturn devoured his own children, and hence also is the continuous cirque of imposts at Stonehenge an apt representation of this well imagined emblem.

[T]here our camp / Lay pitched that day beneath the sun's wide glare, / Amid the omnipresent desert wastes, / And few men stirred abroad. […] [A]nd the tents / Sagged lifeless all around their dusky cirque, / Whose every rope shone burnished in the glare, / And every tent-pin.