Cairn

[skinem]

cairn

Pronunciation: \ˈkern\
Function: noun
Etymology: Middle English (Scots) carne, from Scottish Gaelic carn; akin to Old Irish & Welsh carn cairn
Date: 15th century
: a heap of stones piled up as a memorial or as a landmark
— cairned \ˈkernd\ adjective

Never heard this word used as an adjective.

[gailr]

Cognate to caer?

That adjective is new to me, too.

[sluggo]

Caer = 'fort';
Penrhos = Pen: 'head' + rhos: 'moor'

-- Welsh glossary of place names

Fort Endora?

[gailr]

Fort Endora?

Very nice.

Those fortifications were constructed on and with piles of stones, though.

a heap of stones piled up as a memorial or as a landmark

Perry, can you give us another word for this?

[Perry]

The best that I can come up with is "rock markers". Disappointingly prosaic, isn't it?