The neutron rich Zr isotopes are studied in a relativistic mean-field
approach. A transition from spherical to strongly deformed shapes is o
btained around A congruent-to 100 and ground state deformations are fo
und, which are in size close to superdeformed shapes. Furthermore, ver
y large radii are predicted in the vicinity of the neutron drip line d
ue to the combined effects of deformation and neutron excess.