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We study topological defects arising in the Grand Unification Model$SU(6)_L\otimes SU(6)_c \otimes SU(6)_R \times Z_3$. We show that the modeldoes not contain domain walls, while it produces massive magnetic monopoles andit may, depending on the symmetry breaking chain, give rise to the formation ofstrings. We also discuss their possible relation$ the origin of the highestenergy cosmic rays detected.Comment: Replaced version includes minor corrections along the paper, abstract  updated. 24 pages, Latex file, uses epsf style, two PostScript figures  include

TOPOLOGICAL DEFECTS IN [SU(6)]3× Z3

TOPOLOGICAL DEFECTS IN [SU(6)]³× Z₃