I must confess, that I did not step on Nosy Lonjo in person. I only viewed it from the mainland shore near the city of Diego Suarez. Visiting it is mostly forbidden.  It's an island with a peculiar conical shape that makes it sort of a logo for Diego Suarez. Other than the unique shape, there isn't really much to recommend it. It's supposed to be a sacred island, and from what I was told and have been able to read, there are tombs on the island, and sacrificial rituals have been (are?) performed there. But I don't really see any Outstanding Universal Value at all.