We present a deep spectrophotometric mosaic of the Orion Nebula obtained with the Potsdam Multi-Aperture Spectrophotometer (PMAS) at Calar Alto Observatory. The aim of the observations has been to determine the spatial distribution of physical conditions and chemical abundances across the nebula and at different morphological structures. The 64 arcsec long hexagonal fiber bundle (PPAK) has been used to obtain a complete mosaic of the central 4 arcmin of the nebula in about 16 fields. The spectra cover the whole optical spectral range and permits to derive: a) different line intensity ratios covering all possible ionization states in the nebula; b) electron densities diagnostics based of [S II], [O II], [Cl III] and [Fe III] line ratios; c) electron temperatures from [O III], [N II] and [S II] line ratios as well as the Balmer discontinuity; d) the distribution of ionic and total abundances determined from collisionaly excited lines; e) ionic abundances of C^{2+} and O^{2+} from recombination lines; f) and the abundance discrepancy factor for O^{2+}.