  The study of nuclear limits has been performed and new physical mechanisms
and exotic shapes allowing the extension of nuclear landscape beyond the
commonly accepted boundaries have been established. The transition from
ellipsoidal to toroidal shapes plays a critical role in potential extension of
nuclear landscape to hyperheavy nuclei. Rotational excitations leading to the
birth of particle (proton or neutron) bound rotational bands provide a
mechanism for an extension of nuclear landscape beyond spin zero proton and
neutron drip lines.
