Definition of "kopje"

In one spot only was the solemn monotony of the plain broken. Near the center a small solitary “kopje” rose. Alone it lay there, a heap of round ironstones piled one upon the other, as over some giant’s grave.

1883 June, Ralph Iron [pseudonym; Olive Schreiner], “Shadows from Child-life. The Watch.”, in The Story of an African Farm, 2nd edition, New York, N.Y.: H. M. Caldwell Company, part I, page 9

We selected a lichenous kopje perhaps fifteen yards away, and landed neatly on its summit one after the other.

1900 December – 1901 August, H[erbert] G[eorge] Wells, “Prospecting Begins”, in The First Men in the Moon, London: George Newnes, […], published 1901, page 105

Martha looked over a mile or so of bush to a strip of pink ploughed land; […] and then, ridge after ridge, fold after fold, the bush stretched to a line of blue kopjes.

1952, Doris Lessing, Martha Quest, Panther, published 1974, page 8

On the koppie behind the village, the unsightly red-and-white skeleton of an FM tower.

1978, André Brink, Rumours of Rain, Vintage, published 2000, page 72