Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Monarch Butterfly Biosphere Reserve' has mentioned 'World Heritage' in the following places:
Occurrence Sentence Text Source
The Monarch Butterfly Biosphere Reserve (Spanish: Reserva de Biosfera de la Mariposa Monarca) is a World Heritage Site containing most of the over-wintering sites of the eastern population of the monarch butterfly.
The Reserve was declared a Biosphere Reserve in 1980 and a World Heritage Site in 2008.
[4][5] UNESCO declared the biosphere a World Heritage site in 2008 as a Natural Asset.
The Monarch Butterfly Biosphere Reserve World Heritage property protects key overwintering sites for the monarch butterfly.