How to take possession of lands that do not belong to anyone

The correct view is that reviving the land entitles a person
to take possession of it at any time, because of the general meaning of the
words of the Prophet (peace and blessings of Allaah be upon him):
“Whoever revives dead land, it is his.” Some of the scholars, such as the
Hanafis, stipulate that the permission of the ruler is essential. This is
what is known as allocation of land, which the Prophet (peace and
blessings of Allaah be upon him) used to do, whereby he would give a piece
of a land to a person to make use of it. In this case, whoever revived some
land before 1382 AH, it is his, and whoever revived land with the permission
of the ruler after 1382 AH, it is his. With regard to those tribes, if they
had taken possession of the land by reviving it in the past, then they are
more entitled to it because of their previous ownership. But if they did not
revive it and it was simply part of their village, then they have the right
to prevent anybody else from reviving it if that serves the interests of
their village, so they leave it as vacant land for recreational purposes, or
leave it for future development. In that case if someone revives it, that
will adversely affect them, so they can ask the government to ban anybody
from reviving it, even if the people who want to revive it are from the same
tribe. This is in order to ward off harm.  But if it will cause no adverse
effects and the land is far away from the town, and no one will be affected
and the ruler has given permission, then it is permissible for others to
take possession of it, and they have no right to object. If they want to
have it for themselves, then they have to ask the state for that because
they have more right to it and they do not want people who are not of their
tribe to live near them. In that case the decision rests with the state.