Martin Strel (listenⓘ; born 1 October 1954), is a Slovenian long-distance swimmer, one of the most elite endurance athletes[1] best known for swimming the entire length of various rivers.

"[3] Strel was born in the town of Mokronog, in the Slovenian region of Lower Carniola, then part of the Socialist Federal Republic of Yugoslavia.

In July 2001, he achieved one more world record — 504.5 kilometres (313.5 mi) of non-stop swimming in Danube within 84 hours and 10 minutes.

"[7] He plans to swim across Lake Arenal on 29 September 2010 as part of his visit to an environmentalist international film festival in Costa Rica.

Achievements by year: Strel was the subject and star of a feature documentary entitled Big River Man directed by the acclaimed art-house director John Maringouin.