And these continents are situated in a vast void, similar to the eggs of the "apple snail," every continent gathered densely like eggs on a giant egg sac, but each egg has its own barrier, with no connection to the others.
This barrier is the "Heavenly Dao Shackles."
It is the presence every continent's Heavenly Dao uses to protect itself.
Like how Chen Qiu, under the guise of "Heavenly King," usually traverses the continents, which is actually a rather clever method, but not truly traversing continents. Moreover, it can only be done within his own series of continents, unable to reach other series.
True continental traversal requires crossing the void.
And the barrier outside the continent serves as a means of preventing outsiders from easily entering the continent, unlike the void; it is extremely pitch black. It's precisely the place where the corridor erupted initially, that place is the continent's barrier.