It's definitely Manio. The setting is called the Quadrilataire de Manio and the menhir is the Geant de Manio.
The Quadrilataire is unusual as it is looking less lekely that it ever contained a mound or burials. It could be a unique transistionary monument between the passage 'graves' and cromlechs.
Nearby is the Tetre Tumulaire de Manio. A low mound within which were discovered a number of small kists.
An earlier menhir pokes therough the mound and the whole lot is stradled by the later Kermario Alignements.
Don't know if that's any use...