what is the meaning of River Mouths in the LOSC and law of the sea

Concerning river mouths, Article 9 of the LOSC stipulates:
If a river flows directly into the sea, the baseline shall be a straight line across the mouth of the river between points on the low-water line of its banks. . what is the meaning of River Mouths in the LOSC and law of the sea, Article 9 of the LOSC, law of the sea, LOSC, River Mouths

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