menhir

menhir A single tall standing stone as a monument, especially of prehistoric times.
1963, Thomas Pynchon, V.:

no time has passed since we lived in caves, grappled with fish at the reedy shore, buried our dead with a song, with red-ochre and pulled up our dolmens, temples and menhirs and standing stones to the glory of some indeterminate god or gods ....

On the coast tree ferns and pandanus palms. Inland termite menhirs seventeen feet high.