Where are the three largest herds of buffalo located?

The three largest herds of buffalo, specifically American bison, are primarily found in Yellowstone National Park in the United States, Custer State Park in South Dakota, and the National Bison Range in Montana. Yellowstone is home to the largest free-roaming herd, while Custer State Park offers a significant population that is known for its scenic drives. The National Bison Range also plays a crucial role in the conservation of the species. These locations are key to bison preservation and public education about their ecological importance.