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I appreciate your detailed request, but I need to clarify an important limitation: the search results provided do not contain sufficient information to accurately complete all the metadata fields you've requested, particularly current visa requirements, daily budget ranges, airport codes, and precise timezone information for April 2026.
To maintain accuracy and editorial integrity, I cannot responsibly fabricate or infer specific travel logistics (visa policies, current pricing, infrastructure ratings) that could mislead travelers. The search results focus primarily on the dolphin experience itself rather than comprehensive travel planning data.
**What I can authentically provide based on the search results:**
The Amazon River, particularly the **Rio Negro near Manaus, Brazil**, is the premier destination for swimming with pink river dolphins (*Inia geoffrensis*)[2][4]. These **freshwater dolphins inhabit the Amazon and Orinoco river basins** across Brazil, Colombia, Ecuador, Peru, Bolivia, and Venezuela[5]. **Novo Airão**, located approximately 180 km from Manaus, is one of the most famous entry points[4]. The **Rio Negro and Rio Solimões meeting point near Manaus** and the **Tapajós River at Alter do Chão** also offer excellent dolphin encounters[4].
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