  We study the extremely neutron-rich nuclei for $Z = 17 - 23$, $37 - 40$ and
$60 - 64$ regions of the periodic table by using axially deformed relativistic
mean field formalism with NL3* parametrization. Based on the analysis of
binding energy, two neutron separation energy, quadrupole deformation and root
mean square radii, we emphasized the speciality of these considered regions
which are recently predicted islands of inversion.
