  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 ~1100 pc, Crater 2
is the fourth largest dwarf in the Milky Way, surpassed only by the LMC, SMC
and the Sgr dwarf. With a total luminosity of $M_V\approx-8$, this satellite
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
~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.
