Rare term for a stone circle; the loanword ストーンサークル is far more common in modern Japanese.
See also: ストーンサークル
The term 環状石籬 can be found in archaeological literature.
The common modern term for 'stone circle'; 環状石籬 is a rare, more formal or academic equivalent.
Compound of 環状 (kanjō, 'ring-shaped') + 石籬 (sekiri, 'stone fence/enclosure'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning 'stone circle'.