Image of Maenllwyd y Rhos (Standing Stones) by thesweetcheat

From this angle, there appears to be a curving bank of rubble, which the taller uprights fit into. Bottom of the shot is a slab set on edge which is very kerb-like. Although the triangular pointy stone looks as though it may be natural outcrop, that doesn’t preclude something like a ring cairn being built to incorporate it.

Image credit: A. Brookes (26.4.2022)