The pelican enclosure in Tierpark Berlin comes to my mind as similar exhibit. There the pelicans live in the man- made water moat surrounding the Schloss Friedrichsfelde. They are able to freely roam around, yet they mostly stay in the area along the moat and the chateau. I would assume these birds are clipped, causing both enclosures, in Le Grand Parc and Tierpark Berlin, to practice a kind of animal husbandry that is disputed and in the decline.
https://www.freunde-hauptstadtzoos.de/files/content/freunde/verein/schloss-friedrichsfelde-heute.jpg
https://www.freunde-hauptstadtzoos.de/files/content/freunde/verein/schloss-friedrichsfelde-heute.jpg