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The candidate PeVatron MGRO J1908+06, which shows a hard spectrum beyond 100TeV, is one of the most peculiar $\gamma$-ray sources in the Galactic plane.Its complex morphology and some possible counterparts spatially related withthe VHE emission region, preclude to distinguish between a hadronic or leptonicnature of the $\gamma$-ray emission. In this paper we illustrate a newmultiwavelength analysis of MGRO J1908+06, with the aim to shed light on itsnature and the origin of its ultra high-energy emission. We performed ananalysis of the $^{12}$CO and $^{13}$CO molecular line emission demonstratingthe presence of dense molecular clouds spatially correlated with the sourceregion. We also analyzed 12-years of Fermi-LAT data between 10 GeV and 1 TeVfinding a counterpart with a hard spectrum ($\Gamma \sim 1.6$). Our reanalysisof XMM-Newton data allowed us to put a more stringent constraint on the X-rayflux from this source. We demonstrate that a single accelerator cannot explainthe whole set of multiwavelength data, regardless of whether it acceleratesprotons or electrons, but a 2-zone model is needed to explain the emission fromMGRO J1908+06. The VHE emission seems most likely the superposition of a TeVPWN powered by PSR J1907+0602, in the southern part, and of the interactionbetween the supernova remnant G40.5-0.5 and the molecular clouds towards thenorthern region.

Multiwavelength investigation of the candidate Galactic PeVatron MGRO J1908+06