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Previous studies of the massive nearby galaxy cluster Abell 3558 reported acold front around the cluster core, which is attributed to the sloshing of thecore as it responds to the gravitational disturbance created by a past minormerger. Here, using XMM-Newton mosaic, we report the detection of two rarelarge-scale sloshing cold fronts far outside the cooling radius of Abell 3558.One of the detected cold fronts is located 600 kpc from the cluster core to thesouth-east, while the other is located 1.2 Mpc from the cluster core to thenorth-west. The latter cold front is one of the most distant cold fronts everobserved in a galaxy cluster. Our findings are in agreement with previousstudies that sloshing can extend well beyond the cooling radius, on scalesexceeding half the virial radius, suggesting that sloshing is a cluster-widephenomenon and may affect the cluster's global properties.

Two large-scale sloshing cold fronts in the outskirts of the galaxy cluster Abell 3558