This is only what's recorded; in reality, the number of small worlds far exceeds this figure. Just like some small worlds, even if discovered, if not publicized, others wouldn't know.
Just like the Five Great Sects, when they arrived in the Nine Domains, they discovered a small world, claimed it, and made it their base.
Most entrances to small worlds around the Nine Domains are hidden deep within the void, moving with the chaotic void currents, making them nearly impossible to find.
Finding such a small world is an immense opportunity; Gui Wu Old Ancestor and Heavenly Saint Sword Emperor were quite fortunate to discover such a small world upon arriving in the Nine Domains.
The ancient map in Chu Fengmian's possession is merely a fragment, with only the entrance space coordinates of that small world documented. Many parts are torn away and are still in Gui Wu Old Ancestor's hands.
Thus, Chu Fengmian knows nothing about the small world, even its origins.
