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From 16 years of INTEGRAL/SPI $\gamma$-ray observations, we derive bounds onannihilating light dark matter particles in the halo of the Milky Way up tomasses of about 300 MeV. We test four different spatial templates for the darkmatter halo, including a Navarro-Frenk-White (NFW), Einasto, Burkert, andisothermal sphere profile, as well as three different models for the underlyingdiffuse Inverse Compton emission. We find that the bounds on the s-wavevelocity-averaged annihilation cross sections for both the electron-positronand the photon-photon final states are the strongest to date from $\gamma$-rayobservations alone in the mass range $\lesssim 6$ MeV. We provide fittingformulae for the upper limits and discuss their dependences on the haloprofile. The bounds on the two-photon final state are superseding the limitsfrom the Cosmic Microwave Background in the range of 50 keV up to $\sim 3$ MeV,showing the great potential future MeV mission will have in probing light darkmatter.

Sub-GeV Dark Matter Annihilation: Limits from Milky Way observations with INTEGRAL