When I was in Noumea on a cruise in November 2017, I logged an earthcache that had a 2m high piece of nickel laterite, surrounded by a tropical garden, sitting in the middle of a roundabout. You can't see the rock in the attached picture but at least you get an idea of the garden surrounds. I'll also attach a picture of the rock.

Thanks for this locationless corrunnaroad ... I had to find a locationless starting with an R to help me qualify for a Spell April in April (Coronavirus Edition) challenge set by Cybergam V, and this one struck a chord with me.