Nosy Lonjo d'Antsiranana is a conical island of volcanic origin. It is covered with baobab and mangrove vegetation and is populated by a diverse fauna. It is a sacred burial place of the Sakalava kings and a place of ancestor worship through traditional ceremonies.
Nosy Lonjo d'Antsiranana (On tentative list - Madagascar) Map
Nosy Lonjo d'Antsiranana (On tentative list - Madagascar) Locations
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.