  We give Swampland constraints for the three dimensional Landscape of Anti-de
Sitter gravity in the Chern-Simons formulation with connection valued in
various split real forms of Lie algebras. We derive explicitly the limit on the
number of massless modes by computing the upper bound on the rank of possible
gauge groups and thus validating this Swampland conjecture in 3D. We discuss
the implications of this constraint on the spectrum of higher spin gravity
theories and we compare it with the gravitational exclusion principle required
from BTZ black hole consideration to excerpt a constraint on the Chern-Simons
level k.
