One or two knolls projected, however, and resembled islands in a sea of grass.
"Journal of an Expedition into the Interior of Tropical Australia In Search of a Route from Sydney to the Gulf of Carpentaria (1848) by Lt. Col. Sir Thomas Livingstone Mitchell Kt. D.C.L. (1792-1855) Surveyor-General of New South Wales"
Thomas Mitchell
The main difficulty lies in the descent of the cliff above the "Edge," and in the two or three rocky knolls by which this cliff connects itself with the latter, and from which there is an unpleasant drop on each side....
"Climbing in The British Isles. Vol. 1 - England"
W. P. Haskett Smith
That one looked as level as would the bottom of the sea, from which the water had disappeared and only wrinkled sand remained, while here the sand was more yellowish, heaped up as if in great knolls, covered on the sides with tufts of gray vegetation.
"In Desert and Wilderness"
Henryk Sienkiewicz