Ancel and Cannon have shown
that every embedding of an (n − 1)-sphere in the n-sphere Sn can be approximated
by locally flat embeddings. Here it is shown that any such embedding can be
approximated by locally flat embeddings, the images of which are contained, for
the most part, in a preassigned complementary domain of the original. In
addition, the paper explores conditions implying the existence of better
approximations possessing various properties suggested by high dimensional
analogy with the conclusions of Bing’s 3-dimensional Side Approximation
Theorem.