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We present a study of the galaxy environment of 9 strong HI+CIV absorptionline systems ($16.2<{\rm log}(N({\rm HI}))<21.2$) spanning a wide range inmetallicity at $z\sim4-5$, using MUSE integral field and X-Shooterspectroscopic data collected in a $z\approx 5.26$ quasar field. We identifygalaxies within a 250 kpc and $\pm1000$ km s$^{-1}$ window for 6 out of the 9absorption systems, with 2 of the absorption line systems showing multipleassociated galaxies within the MUSE field of view. The space density ofLy$\alpha$ emitting galaxies (LAEs) around the HI and CIV systems is$\approx10-20$ times the average sky density of LAEs given the flux limit ofour survey, showing a clear correlation between the absorption and galaxypopulations. Further, we find that the strongest CIV systems in our sample arethose that are most closely aligned with galaxies in velocity space, i.e.within velocities of $\pm500$ km s$^{-1}$. The two most metal poor systems liein the most dense galaxy environments, implying we are potentially tracing gasthat is infalling for the first time into star-forming groups at high redshift.Finally, we detect an extended Ly$\alpha$ nebula around the $z\approx 5.26$quasar, which extends up to $\approx50$ kpc at the surface brightness limit of$3.8 \times 10^{-18}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$. After scaling forsurface brightness dimming, we find that this nebula is centrally brighter,having a steeper radial profile than the average for nebulae studied at$z\sim3$ and is consistent with the mild redshift evolution seen from $z\approx2$.

Into the Ly{\alpha} jungle: exploring the circumgalactic medium of galaxies at z ~ 4-5 with MUSE