What is the land beyond the community called?
There is no real word for the land beyond the community that is still part of the society that Jonas lives in. We know that there are other communities out there that are all pretty much the same, but they don't have a particular name.
What does have a name is the stuff that is not part of the overall community. All of that, which people know nothing about, is called Elsewhere. No one has ever been there and no one really knows for sure whether it exists, but they talk about it and talk about, for example, applying for "Elsewhere."
In the book "The Giver" Jonas tells the Giver that he senses something or someplace. Jonas has been absorbing the dreams which the Giver has been passing onto him. There is mention in the book of other communities. Jonas' sister talks about having not liked a child that was at a different place that they had visited. However, that place is not the someplace else that Jonas senses.
Prior to this information, Jonas and the Giver are discussing his orientation as a receiver of the information the Giver will give him. The Giver tells Jonas that there is much more than the now and where they are. He tells him:
"There's much more. There's all that goes beyond-all that is Elsewhere-and all that goes back, and back, and back, and back."(78)
It is later that Jonas begins to sense the Elsewhere beyond where the sleigh stops and memories end.