Marathon Swimming Career
Montsrrat was a pioneer of many marathon swims and was the first Spanish women to swim the Strait of Gibraltar in 1957 in 5 hours 18 minutes and the first Spaniard to swim the English Channel in 1958. In 1961, she again crossed the English Channel in the opposite direction from France to England to become the first women to swim the English Channel in both directions. In 1969, she swam the Menorca Channel from the island of Menorca to the island of Majorca in Spain in 21 hours 10 minutes and across Lough Neagh in 16 hours 13 minutes. She also swam from Santa Fe to Coronda in Argentina and from Concordia in Argentina to Columbus, Uruguay.
She serves on the Board of Directors of both the Channel Swimming Association and the International Marathon Swimming Hall of Fame acts as an official observer on many attempts to swim the English Channel and the Strait of Gibraltar.
She also was a 2011 recipient of the Real Orden del Merito Deportivo awarded to her by H.R.A. Infanta Cristina representing the Spanish Government.
She is also a long-time representative and Vice President of the Channel Swimming Association.
She was the subject of Montserrat Tresserras, la vencedora del canal, a book published in 1959.