Which one of the following is not a site for in-situ method of conversion of flora?

In-situ conservation, the conservation of species in their natural habitats, is considered the most appropriate way of conserving biodiversity. Conserving the areas where populations of species exist naturally is an underlying condition for the conservation of biodiversity. That\'s why protected areas form a central element of any national strategy to conserve biodiversity. These include national parks, sanctuaries, biosphere reserve, nature reserve, natural monuments, and cultural landscapes, etc.  Zoos and Botanical gardens are the most conventional methods of ex-situ conservation.