  We report on the discovery and transport study of the superconducting ground
state present at the (111)LaAlO$_3$/SrTiO$_3$ interface. The superconducting
transition is consistent with a Berezinskii-Kosterlitz-Thouless transition and
its 2D nature is further corroborated by the anisotropy of the critical
magnetic field, as calculated by Tinkham. The estimated superconducting layer
thickness and coherence length are 10 nm and 60 nm, respectively. The results
of this work provide a new platform to clarify the microscopic details of
superconductivity at LaAlO$_3$/SrTiO$_3$ interfaces, in particular in what
concerns the link with orbital symmetry.
