It was said that the Magical Gardens lay somewhere in Europe.
To prevent poachers and certain greedy individuals from destroying and plundering the Magical Gardens, the International Confederation of Wizards had hidden them away several centuries ago.
Most wizards did not even know such a place existed, let alone its exact location.
Nowadays, the Magical Gardens were known only within the circles of potion brewers and Herbologists.
Thus, Hogwarts' Thestral carriage naturally could not travel directly to the Magical Gardens. Their destination was Beauxbatons Academy of Magic in France.
By longstanding convention, the school teams participating in the Magical School Potion Championship would gather at a temporary meeting point before using a Portkey to travel to the Magical Gardens together.
Yes, reaching the Magical Gardens required a special Portkey.
Much like Azkaban Prison in England, its purpose was to prevent other wizards from learning the Magical Gardens' exact location.
However, many wizards had once speculated that the Magical Gardens lay within France, or in forests near France. Yet those greedy people had joined forces to search all of France and the surrounding forests, only to find no trace of the Magical Gardens.
Professor Slughorn had told the two of them all this. Naturally, he did not know the exact location either. It was said that the wizards who knew were all "Obliviators," sworn to protect the Magical Gardens.
However, Albert thought Hertok Dagworth likely knew the exact location of the Magical Gardens, or could travel there whenever he wished. Those were certain privileges of a Potions Master.
By the time the Thestral carriage reached France, dusk was near. The sky had been dyed fiery red by the evening glow. The carriage flew toward the Pyrenees Mountains on the border between France and Spain. Looking down through the carriage window, they