The Volcán Tacaná Biosphere Reserve (Spanish: Reserva de Biosfera Volcán Tacaná) (established 2006) is a UNESCO Biosphere Reserve at the Tacaná Volcano in Chiapas, Mexico, on the border with Guatemala. The volcano is part of the Central America Volcanic Arc (Nucleo Centroamericano). The 6,378 hectares (24.63 sq mi) reserve contains fragile ecosystems very rich in wild flora and fauna species of cultural, scientific, economic and biological relevance. Its rich biodiversity and high endemism are found particularly in the high mountain ecosystem and landscapes and in the volcanic edifice which presents geophysical features of great scientific and aesthetic value. Average annual rainfall can amount to 2,000–5,000 millimetres (79–197 in), as in the case of Soconusco.