Ravenloft & Spelljammers

As someone mentioned before, Ravenloft is actually a demi-plane, found
like a floating island in the etheral plane.  As a result, you cannot spelljam
directly to Ravenloft.

However, I did read somewhere (I forget which book), that the mists of
Ravenloft can also appear in Wildspace, and as a result could swallow
up a spelljamming ship.  Good luck getting home, though!   :-)

-Steve