This unknown existing village is where the winged centaurs of the Tenba clan exist. All of the centaurs here have wings though they hardly use them because they dont have anywhere to travel to.
The village is hidden deep within a forest in Grass country and is kept secret to all but a few select outsiders and the secret is kept that way thanks to a genjutsu that turns travelers away from approaching their village.

((The likeness of somehow entering the village is very unlikely. Only kages and Sannins would be welcomed and only if they are friends of Grass Country, seeing that the centaurs follow the alliances of Grass Village and tend to be friends with those who are friends with the village kage.
This village does not have a kage but has a chief centaur. They do have nins, their own acadamy, and clan jutsus but most of them have their own ranks like elite guard and Healer.
Lastly, it is unlikely that a centaur would publically travel with others that arent his kind and when they do they stick to the air. The only centaur who periodically travels outside of the village is Tame Dore.))