The Biosphere Reserve includes an additional 2,570 kmÂ , and a further 914 kmÂ are included in a `` Cultural Zone '' ( which also given protection ) , bringing the total area up to 18,811 kmÂ . The Biosphere Reserve includes an additional 2,570 kmÂ , and a further 914 kmÂ are included in a `` Cultural Zone '' ( which also is afforded a level of protection ) , bringing the total area up to 18,811 kmÂ .