Question: Which national park is home of Australia's second bird observatory, which received a royal visit from Charles and Diana in 1985?
Sentence (from "Rotamah Island Bird Observatory"): Rotamah Island Bird Observatory was established in 1979 on Rotamah Island in the Gippsland Lakes National Park in eastern Victoria, Australia, by Birds Australia as Australia's second bird observatory, in order to provide a base for the study and enjoyment of the birds of the area.
Relevant evidence: Yes