Question: Which national park is home of Australia's second bird observatory, which received a royal visit from Charles and Diana in 1985?

Context paragraphs:
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.  Rotamah Island had previously been a farming property, and the observatory was established in 'Overstrand', the homestead built in 1908.  In 1985 the observatory was visited by Prince Charles and Diana, Princess of Wales.

Bird Conservancy of the Rockies: The Bird Conservancy of the Rockies was first founded in 1988 as Colorado Bird Observatory and later changed to Rocky Mountain Bird Observatory.  Its goal was to address bird conservation needs in the Western United States.  Its headquarters are located in Barr Lake State Park, just east of Brighton, Colorado.  In 2015 the organization changed to its current name in order to more accurately reflect the regions of its work, which radiates from Colorado to the Great Plains, Mexico and beyond.

Prince Edward Point Bird Observatory: The Prince Edward Point Bird Observatory is a bird observatory located in the Prince Edward Point National Wildlife Area, located on Prince Edward Point in the south-east corner of Prince Edward County, Ontario, Canada.  The National Wildlife Area was established in 1978 covering 560 hectares.  The observatory was established in 1995 to monitor bird migrations across the point, continuing the work of the Kingston Field Naturalists who performed similar work in the 1970s and 1980s.  The observatory was designated a Globally Important Birding Area in 1998 by the Canadian Nature Federation and Bird Studies Canada.  It is also an International Monarch Butterfly Reserve.

Women's rowing in Australia: While not being urged to avoid competition, women had few opportunities to compete in sport in Australia until the 1880s.  After that date, new sporting facilities were being built around the country and many new sport clubs were created.  During the 1890s, cricket and rowing two of the most popular competitive sports for women in Australia.  A sculling race was held between two women from Victoria and New South Wales at the Albert Park Lake in Melbourne in 1901, during a regatta organised to celebrate a royal visit.  The first recorded women's rowing club was the Albert Park Ladies' Rowing Club, formed in 1907 and based at Albert Park, with similar clubs formed in Brisbane in 1908 (the Brisbane LRC), Sydney in 1909 (the Western Suburbs LRC), and Tasmania in 1912 (the Buckingham LRC and the Sandy Bay LRC).  During that time period, rowing was considered an acceptable sport for women to participate in, and was one of the first sports in which women were required to practise daily in order to excel at it.  Interstate competition commenced in 1912, when the Brisbane club travelled to Melbourne to race the Albert Park crew.  A return race was held the following year in Queensland, but no more interstate events were held until after the conclusion of World War I, when a Victorian crew lost to a South Australian crew in Adelaide.  The Women's Four-Oared Championship of Australia was first contested in 1920, in conjunction with the men's King's Cup, and was won by South Australia, who were to win seven of the first eight tournaments.

Melbourne Mint: The Melbourne Mint, in Melbourne, Australia, was a branch of the British Royal Mint.  It minted gold sovereigns until 1931 and half-sovereigns until 1915.  In 1916 it commenced minting Commonwealth silver threepences, sixpences, shillings and florins.  From 1923 it minted all pre-decimal denominations.  It minted rarities such as the 1921/22 overdate threepence, 1923 half-penny and 1930 penny, as well as Australia's four commemorative florins in 1927 (Canberra), 1934/35 (Melbourne Centenary), 1951 (Federation Jubilee) and 1954 (Royal Visit).  It assisted the Royal Australian Mint in Canberra in producing one cent coins from 1966 to 1968 and two cent coins in 1966.  From 1969 all coin production moved to the Royal Australian Mint in Canberra.  It is now the home of the Royal Historical Society of Victoria, and has been leased to the private sector since 2001.

Barren Grounds Bird Observatory: The Barren Grounds Bird Observatory was a bird observatory situated in the Barren Grounds Nature Reserve on the escarpment of the Southern Highlands of New South Wales, Australia.  It was opened in 1982 by Birds Australia as Australia's third bird observatory, in order to provide a base for the study and enjoyment of the birds of the area.  The natural vegetation of Barren Grounds is heathland.  Birds of note include the eastern ground parrot and the eastern bristlebird.  In 2004, for basically economic reasons, the observatory was closed and Birds Australia's association with Barren Grounds ended.

Whitefish Point Bird Observatory: The Whitefish Point Bird Observatory (WPBO) is located in Chippewa County, Michigan, USA, adjacent to the Whitefish Point Unit of the Seney National Wildlife Refuge.  It operates as a non-profit, affiliate education and research facility of the Michigan Audubon Society.  The Society and the WPBO together have recorded over 300 species of birds at Whitefish Point.  As one of a network of bird observatories in the Canadian Migration Monitoring Network, the WPBO documents the bird population of the Great Lakes region through bird banding, data collection, and research studies.

Creamer's Field Migratory Waterfowl Refuge: Creamer's Field Migratory Waterfowl Refuge is a 2,200 acre (7.3 km²) bird sanctuary, located within the Fairbanks North Star Borough in the U.S. state of Alaska and partially within the city limits of Fairbanks.  It consists of wetlands, fields, and forests. Except to the south, the refuge surrounds the former farm of Charles Hinckley and later Charles Albert Creamer (1889-1974), a former chicken rancher from Washington state who moved to Fairbanks.  Creamer saved waste grains from his barn to feed migrating birds.  After Creamer's death, preservationists banded together to make the area a state sanctuary associated with the Alaska Bird Observatory.  The Creamer farmstead now serves as a visitor center and environmental education center.

Bird Studies Canada: Bird Studies Canada (BSC) is Canada's national bird conservation organization.  BSC began as the "Long Point Bird Observatory" in 1960, changing its name in 1998 to reflect the growing national scope of its research programs.  Its mission is to advance the understanding, appreciation and conservation of wild birds and their habitats through studies that engage the skills, enthusiasm and support of volunteers, members, staff and the interested public.  BSC conducts a wide range of local, regional, national and international programs, dependent upon the active involvement of thousands of volunteer "Citizen Scientists", guided by a small group of professional scientists.  Its national headquarters are located near Port Rowan and Long Point, Ontario, Canada.

Diana, Princess of Wales: Diana, Princess of Wales (Diana Frances; "née" Spencer; 1 July 1961 – 31 August 1997), was a member of the British royal family as the first wife of Charles, Prince of Wales, who is the eldest child and heir apparent of Queen Elizabeth II.

Supporting paragraphs: Rotamah Island Bird Observatory Diana, Princess of Wales
Answer: Gippsland Lakes