The area of Herstmonceux Park is 45,000.0 square meters.
Assuming you meant 'Herstmonceux Castle' - it's in east Sussex.
Herstmonceux Castle was built as a residence by a man named Roger Fiennes, a descendant of the Monceux family, which had a manor house at the site. For some time, his heirs lived in the castle. Please use the link below for more information.
The area of Manor Park Country Park is 210,436.5339648 square meters.
The area of Camer Park Country Park is 161,874.256896 square meters.
The area of Camden Park - amusement park - is 105,218.2669824 square meters.
The area of Park Lake Provincial Park is 2,500,000.0 square meters.
The area of Central Park - amusement park - is 161,874.256896 square meters.
The area of Central Park - amusement park - is 161,874.256896 square meters.
The area of Brywood Park is 24,281.1385344 square meters.
The area of Gatineau Park is 361.307 square kilometers.
The area of Utsubo Park is 97,000.0 square meters.
The area of Adderley Park is 32,374.8513792 square meters.