Boca Tavala (24°15'N., 107°28'W.) is the outlet of the Rio San Lorenzo. It is also the entrance to a large lagoon which runs SE for over 30 miles and is enclosed by a narrow strip of land. Sierra de San Sebastian, a high range of mountains, rises inland of the lagoon, 15 to 25 miles from the coast. Pico Chuchamone, 1,507m high, forms the summit of this conspicuous range. A prominent chimney stands 2 miles NW of Boca Tavala and El Dorado Light is shown from a tower standing close E of it.

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