Courtesy of Daniel Vizeu Costa Couto who updates the website of Abilio Couto, an International Marathon Swimming Hall of Fame Honour Swimmer.

In the the second edition of the Maraton Internacional de Rio Abierto (also known as the Maraton Nautica Internacional Hernandarias – Parana) held in February 1966, the following professional marathon swimmers participated in the 88 km (54.6-mile) downstream river race:

*Giulio Travaglio (Italy)
*Horacio Iglesias (Argentina)
*Herman Willemse (Netherlands)
*Abdel Latif Abou-Heif (Egypt)
*Edward Fordsbry (Canada)
*Roberto Reta Seery (Argentina)
*Marwan Saleh (Syria)
*Jalal Zidan (Syria)
*Mahmoud Hanafi (Egypt)
*Nabil El Shazly (Egypt)
*Pedro Galmez (Argentina)
*Osvaldo Schellemberg (Argentina)
*Florencio Romero (Argentina)

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