It is said that the Giant White Stallion can be found in the southeast, near a body of water dubbed “Lake of the Horse God” (It’s fitting, isn’t it?) You can see it on your map, and it crosses a bridge, as well as a path to the right. The Giant White Stallion stands in the middle of the valley, just beyond the Horse God Bridge.
You can either follow the path with a horse you have already tamed and cross the bridge to find the White Stallion, or you can go straight southeast from the stable. The Stone Talus is before the bridge, but you can ride past it quickly. The monster camp is on the way from the stable to the valley.
How to Tame the Giant White Stallion in Tears of the Kingdom
To soothe the horse and then ride it back to its stable, you must have more than one wheel of stamina. Generally, you should pack a few stamina-restoring meals in case your wheel runs out, but if you already have two full stamina wheels, you can skip meal prep, but you’ll need to soothe really hard.