Boca Teacapan (22°30'N., 105°45'W.), lying 22.5 miles SE of the Rio del Baluarte, is the outlet of two extensive lagoons. The mouth is marked by a light. A continuously breaking bar fronts the entrance and extends up to about 2 miles offshore. The lagoons are accessible only by small craft. Anchorage can be taken off the entrance, about 0.8 mile seaward of the outer edge of the bar.