Valle Grande Aventura run a fourteen-kilometre rafting trip on the Atuel from their base at km 35.5 of Ruta 173, in the upper part of Valle Grande. It is the family end of Argentine rafting: grade II water, warm in summer, and more about the canyon scenery than the rapids.
Their WhatsApp is a San Rafael landline number rather than a mobile, which is why it carries no 9 after the country code — WhatsApp Business runs on landlines, and this is the number they publish on their own booking link. They also handle date changes over WhatsApp.
The address is theirs; the pin marks the Valle Grande dam beside it.