We announce the discovery of the Crater 2 dwarf galaxy , identified in imaging data of the VST ATLAS survey .
Given its half-light radius of \sim 1100 pc , Crater 2 is the fourth largest satellite of the Milky Way , surpassed only by the LMC , SMC and the Sgr dwarf .
With a total luminosity of M _ { V } \approx - 8 , this galaxy is also one of the lowest surface brightness dwarfs .
Falling under the nominal detection boundary of 30 mag arcsec ^ { -2 } , it compares in nebulosity to the recently discovered Tuc 2 and Tuc IV and UMa II .
Crater 2 is located \sim 120 kpc from the Sun and appears to be aligned in 3-D with the enigmatic globular cluster Crater , the pair of ultra-faint dwarfs Leo IV and Leo V and the classical dwarf Leo II .
We argue that such arrangement is probably not accidental and , in fact , can be viewed as the evidence for the accretion of the Crater-Leo group .