No lakes exist on the surface, at least within the territories occupied by the white men. Some small sheets of water, called aguadas, may be found here and there, and are fed by the underground current; but they are very rare. There are three or four near the ruins of the ancient city of Mayapan: probably its inhabitants found in them an abundant supply of water. Following all the same direction, they are, as some suppose, no doubt with reason, the outbreaks of a subterranean stream that comes also to the surface in the senote of _Mucuyché_. A mile or so from Uxmal is another aguada; but judging from the great number of artificial reservoirs, built on the terraces and in the courts of all the monuments, it would seem as if the people there depended more on the clouds for their provision of water than on the wells and senotes. Yet I feel confident that one of these must exist under the building known as the Governor’s house; having discovered in its immediate vicinity the entrance--now closed--of a cave from which a cool current of air is continually issuing; at times with great force. I have been assured by Indians from the village of Chemax, who pretend to know that part of the country well, that, at a distance of about fifty miles from the city of Valladolid, the actual largest settlement on the eastern frontier, in the territories occupied by the SANTA CRUZ Indians, there exists, near the ruins of _Kaba_, two extensive sheets of water, from where, in years gone by, the inhabitants of Valladolid procured abundant supply of excellent fishes. These ruins of Kaba, said to be very interesting, have never been visited by any foreigner; nor are they likely to be for many years to come, on account of the imminent danger of falling into the hands of those of Santa Cruz--that, since 1847, wage war to the knife against the Yucatecans. On the coast, the sea penetrating in the lowlands have formed sloughs and lakes, on the shores of which thickets of mangroves grow, with tropical luxuriancy. Intermingling their crooked roots, they form such a barrier as to make landing well nigh impossible. These small lakes, subject to the ebb and flow of the tides, are the resort of innumerable sea birds and water fowls of all sizes and descriptions; from the snipe to the crane, and brightly colored flamingos, from the screeching sea gulls to the serious looking pelican. They are attracted to these lakes by the solitude of the forests of mangroves that afford them excellent shelter, where to build their nests, and find protection from the storms that, at certain season of the year, sweep with untold violence along the coast: and because with ease they can procure an abundant supply of food, these waters being inhabited by myriads of fishes, as they come to bask on the surface which is seldom ruffled even when the tempest rages outside.