Many folks use the preposition 'a' after 'aquí tenemos' when what they're presenting to you is known to them (like the Chipitín Waterfall in your example), but the listener does not know about it.
As you know, a speaker always uses a personal 'a' when presenting/introducing a person to you, using the same 'aquí tenemos' opening. They'll introduce the person either by name or by a noun that describes/references the person (like stating their occupation, status, or title).
Last edited by Rusty; January 31, 2022 at 11:46 PM.
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