* No Central Registry: There isn't a global organization that keeps track of all Arabian horses in the world.
* Varying Definitions of "Herd": A herd could refer to a group of horses living together in a single location, a breeding program, or a collection of horses owned by a single person or organization.
* Private Ownership: Many Arabian horses are privately owned, making it difficult to track their numbers.
Possible Candidates:
* Saudi Arabia: Saudi Arabia has a long history of breeding Arabian horses and is likely home to a large number of them, both in private ownership and in state-run breeding programs.
* United States: The US has a large and active Arabian horse community, with several well-established breeding programs and a significant number of private owners.
* Other Arabian Peninsula Countries: Countries like the United Arab Emirates, Oman, and Kuwait also have a strong tradition of Arabian horse breeding and likely have large populations.
To find out more about a specific region's Arabian horse population, you could:
* Contact Arabian horse associations: National or regional Arabian horse associations might have statistics on their members' horses.
* Research breeding programs: Look for information on large-scale breeding programs in different countries.
* Consult equine databases: Some databases may have information about Arabian horses, though this data might be limited.
Ultimately, determining the exact location of the "biggest" Arabian horse herd is difficult due to the lack of centralized data.