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Over the last decade there has been immense progress in the follow-up ofshort and long GRBs, resulting in a significant rise in the detection rate ofX-ray and optical afterglows, in the determination of GRB redshifts, and of theidentification of the underlying host galaxies. Nevertheless, our theoreticalunderstanding on the progenitors and central engines powering these vastexplosions is lagging behind, and a newly identified class of `ultra-long' GRBshas fuelled speculation on the existence of a new channel of GRB formation. Inthis paper we present high signal-to-noise X-shooter observations of the hostgalaxy of GRB130925A, which is the fourth unambiguously identified ultra-longGRB, with prompt gamma-ray emission detected for ~20ks. The GRB line of sightwas close to the host galaxy nucleus, and our spectroscopic observations coverboth this region along the bulge/disk of the galaxy, in addition to a brightstar-forming region within the outskirts of the galaxy. From our broadwavelength coverage we obtain accurate metallicity and dust-extinctionmeasurements at both the galaxy nucleus, and an outer star-forming region, andmeasure a super-solar metallicity at both locations, placing this galaxy withinthe 10-20% most metal-rich GRB host galaxies. Such a high metal enrichment hasimplications on the progenitor models of both long and ultra-long GRBs,although the edge-on orientation of the host galaxy does not allow us to ruleout a large metallicity variation along our line of sight. The spatiallyresolved spectroscopic data presented in this paper offer important insightinto variations in the metal and dust abundance within GRB host galaxies. Theyalso illustrate the need for IFU observations on a larger sample of GRB hostgalaxies at varies metallicities to provide a more quantitative view on therelation between the GRB circumburst and the galaxy-whole properties.

Super-solar metallicity at the position of the ultra-long GRB130925A