  This work brings to light some partial \emph{anabelian behaviours} of
analytic annuli in the context of Berkovich geometry. More specifically, if $k$
is a valued non-archimedean complete field of mixed characteristic which is
algebraically closed, and $\mathcal{C}_1$, $\mathcal{C}_2$ are two $k$-analytic
annuli with isomorphic tempered fundamental group, we show that the lengths of
$\mathcal{C}_1$ and $\mathcal{C}_2$ cannot be too far from each other. When
they are finite, we show that the absolute value of their difference is bounded
above with a bound depending only on the residual characteristic $p$.
