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Abell 3266 is one of the X-ray brightest galaxy clusters in the sky and is awell-known merging system. Using the ability of the eROSITA telescope onboardSRG (Spectrum R\"ontgen Gamma) to observe a wide field with a single pointing,we analysed a new observation of the cluster out to a radius of R_200. TheX-ray images highlight sub-structures present in the cluster, including thenorth-east--south-west merger seen in previous ASCA, Chandra, and XMM-Newtondata, a merging group towards the north-west, and filamentary structuresbetween the core and one or more groups towards the west. We compute spatiallyresolved spectroscopic maps of the thermodynamic properties of the cluster,including the metallicity. The merging subclusters are seen as low entropymaterial within the cluster. The filamentary structures could be the rims of apowerful outburst of an active galactic nucleus, or most likely materialstripped from the western group(s) as they passed through the cluster core.Seen in two directions is a pressure jump at a radius of 1.1 Mpc, which isconsistent with a shock with a Mach number of ~1.5-1.7. The eROSITA dataconfirm that the cluster is not a simple merging system, but it is made up ofseveral subclusters which are merging or will shortly merge. We computed ahydrostatic mass from the eROSITA data, finding good agreement with a previousXMM-Newton result. With this pointing we detect several extended sources, wherewe find secure associations between z=0.36-1.0 for seven of them, that isbackground galaxy groups and clusters, highlighting the power of eROSITA tofind such systems.

Studying the merging cluster Abell 3266 with eROSITA