  Let $(M,g)$ be a compact, Riemannian manifold and $V \in C^{\infty}(M;
\mathbb{R})$. Given a regular energy level $E > \min V$, we consider
$L^2$-normalized eigenfunctions, $u_h,$ of the Schrodinger operator $P(h) = -
h^2 \Delta_g + V - E(h)$ with $P(h) u_h = 0$ and $E(h) = E + o(1)$ as $h \to
0^+.$ The well-known Agmon-Lithner estimates \cite{Hel} are exponential decay
estimates (ie. upper bounds) for eigenfunctions in the forbidden region $\{ V>E
\}.$ The decay rate is given in terms of the Agmon distance function $d_E$
associated with the degenerate Agmon metric $(V-E)_+ \, g$ with support in the
forbidden region.
  The point of this note is to prove a partial converse to the Agmon estimates
(ie. exponential {\em lower} bounds for the eigenfunctions) in terms of Agmon
distance in the forbidden region under a control assumption on eigenfunction
mass in the allowable region $\{ V< E \}$ arbitrarily close to the caustic $ \{
V = E \}.$ We then give some applications to hypersurface restriction bounds
for eigenfunctions in the forbidden region along with corresponding nodal
intersection estimates.
