Photo credit: Mehrajmir13. Used under this licence.
It is rather obvious that the place in the picture is not in Cornwall.
Back in 2009 I did a post about some puzzling Cornish place-names. Today one of those puzzles has been solved. Sona Merg is a large house a few minutes walk from where I live. Nearby there is a small estate of modern houses called Sona Merg Close. Today I went to an exhibition of local history — photographs, documents etc. There was one folder about Sona Merg which explained that the name is Kashmiri and means ‘golden valley’. The house was apparently built and named by someone who had returned from service in India in the 19th century.
Actually, the Wikipedia entry gives the name as Sonamarg, which is very probably why I couldn’t find it in 2009. Also the meaning in Wikipedia is ‘golden meadow’. You can see part of the area in the picture.