Within the Ethereal Plane, demiplane islands and creatures both odd and dangerous float in an endless field of possibility. Canny folks know that the Ethereal also leads the way to the Inner Planes, infinite arenas of elemental fury. See, it's more than just a backdrop to other adventures - the plane itself offers wonder and opportunity for those with courage enough to explore its limitless expanse.
Used availability for Bruce R Cordell's A Guide to the Ethereal Plane