  We consider meson-baryon interactions in S-wave with strangeness -1. This is
a non-perturbative sector populated by plenty of resonances interacting in
several two-body coupled channels.We study this sector combining a large set of
experimental data. The recent experiments are remarkably accurate demanding a
sound theoretical description to account for all the data. We employ unitary
chiral perturbation theory up to and including \cal{O}(p^2) to accomplish this
aim. The spectroscopy of our solutions is studied within this approach,
discussing the rise from the pole content of the two \Lambda(1405) resonances
and of the \Lambda(1670), \Lambda(1800), \Sigma(1480), \Sigma(1620) and
\Sigma(1750). We finally argue about our preferred solution.
