"During the period of low water, which lasts for barely three months in the year--from September to the end of December--there are only two channels with a less depth than 21 feet, that of Las Hermanas and that of Paraguayo. In the former, the island of Las Hermanas separates the bed of the river into two channels, of which the one most in general use hitherto has a depth of only 20 feet; but vessels may avoid it to-day, as the western channel has been dredged and deepened, and is of more than sufficient depth.

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