Between the mouth of the Magdalena and Santa Marta is the Cienaga de Santa Marta, a large marshy lagoon separated from the sea by a narrow sand spit, having its "boca" or outlet at its eastern side.
To the vicinity of the Boca Jambeli on the southern shore of the Gulf of Guayaquil, in lat.
In his expedition (1531-1532) he entered its principal outlet, the Boca de Navios, and, at the cost of many lives, ascended to the junction of the Meta with the parent stream.
Maintaining its eastern course from the Apure, the main stream finds its way along the southern side of the delta, where it is called the Corosimi river, and enters the sea at the Boca Grande; but in front of the Tortola island, at the beginning of the Corosimi and too m.
The Boca Grande outlet is the deepest, and is the main navigable entrance to the Orinoco at all seasons, the muddy bar usually maintaining a depth of 16 ft.