[[-- Translated text (es -> en) --]] Colleagues, at https://www.miviajeporelmundo.com/guia-recorrer-ruta-de-los-cenotes you can find a guide to visit some of the natural formations most unique in the Yucatan peninsula. It's about the cenotes ("sinkholes") in the limestone rock, wells, sometimes very deep, of water current, underground rivers, of transparency and remarkable colors. Diego, in particular, with this I begin to answer the question that You made an offlist, but I think it's worth it for everyone to know you. Alejandro Pisanty -- - - - - - - - - - - - - - - - - - - - - - - - - Dr. Alejandro Pisanty Faculty of Chemistry UNAM Av. Universidad 3000, 04510 Mexico DF Mexico +525541444475 Blog: http://pisanty.blogspot.com LinkedIn: http://www.linkedin.com/in/pisanty Join the UNAM group on LinkedIn, http://www.linkedin.com/e/gis/22285/4A106C0C8614 Twitter: http://twitter.com/apisanty ---->> Join ISOC Mexico, http://www.isoc.org . . . . . . . . . . . . . . . .