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Let's see this drawing I have in here. Look at the river, the river source, as I explained to you before, river source, el nacimiento del río, and the river mouth, you know, that the river flows into, in this case, in a sea, you know.

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And also we have tributary here, you know, small rivers that flows into the main river here, tributary, you see.

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and also you have confluence the confluence is the place where a tributary in the river

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confluence you know confluyen la confluencia you know and a watershed we will explain later

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with a watershed in spain so we have three watersheds we will explain later okay