Laguna Campechen, Mexico
South of Tulum, Laguna Campechen lies on the northern border of Sian Ka'an Biosphere Reserve. Maya hand-excavated canals link Boca Paila [the sea entrance] to Laguna Chunyaxche and Laguna Muyil, where ancient ruins are located. Laguna Campechen is also linked creating a vast inland waterway of narrow canals and big lakes