Maya Merhige joined the challenge over the weekend as part of Swim Across America to raise money for cancer research.
The high school junior from California completed the daunting task in eight hours and 43 minutes.
"Whatever I'm doing in my swimming, or whatever pain I go through in my swims, it's really nothing compared to the struggle that cancer families go through," Merhige said. "And that really pushes me to keep going forward."
Merhige swam with a team close by, including an observer and her parents supporting her journey.
Over the past eight years she has raised more than $60,000 with Swim Across America.
"Knowing that the money I'm raising makes a difference really encourages me to keep going," she said. "And through my fundraising, I hope that we can kind of end cancer."
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