WIZARDING SCHOOLS AROUND THE WORLD: AUSTRALIA
Originally located in Arnhem Land, The Australian College of Sorcery and Witchcraft was a sprawling campus of large huts that eventually coalesced into one single structure. The college detached from mainland Australia soon after British settlement in order maintain their practices and culture. Ever since, the school has been drifting haphazardly in the ocean, although it never strays far from the Australian coast for ancient magic keeps the school tethered to Australian soil. Every year, a team of witches and wizards must be employed to anchor the floating campus so students aren’t forced into a cat-and-mouse chase at the beginning of the year in order to attend school (a frustrating endeavour which often results in the postponing of classes due to a large number of absences). To students’ great enjoyment, various creatures (including the occasional mermaid) can often be found sunbathing around the perimeter of the campus which gently slopes into the water. Due to their exposure to unusually friendly oceanic creatures, the college boasts incredibly extensive courses in aquatic-life studies, and is held in high esteem by the international wizarding community for its innovations in water magic.
This is the kind of worldbuilding that Harry Potter SORELY lacked.
Don’t get me wrong, Harry Potter are great books (or at least they are from book 3 onwards, but that’s my opinion). But they are incredibly insular, and whatever elements you do learn about the larger world are pretty much only extended as far as how the relate to the titular character.
This lack of expansive worldbuilding, in my mind, is why Harry Potter is not up there with some of the best fantasy literature like Lord of the Rings.