10/10/2026
We are stoked to introduce you to our Silver Partner: Massachusetts Open Water Swimming Association!
The Massachusetts Open Water Swimming Association has been building a thriving open water community right here in New England for the past decade and a half. Founded by swimmers in 2010, the all-volunteer organization oversees a range of group and solo swim events that serve upwards of 200 swimmers every summer. From a 1-mile ocean introduction swim to solo marathon swims exceeding 24-miles, MOWSA has a swim for every body.
MOWSA’s flagship event, the 8-mile Boston Light Swim, is the oldest marathon swim still running in the United States. First staged in 1907, this historic event offers cold water, variable conditions, and a hearty challenge to swimmers looking to level up in open water. MOWSA is proud to be the steward of that event and pleased to continue providing access to one of the coolest sporting events in Boston.
MOWSA also offers the Jim Doty Memorial 1- and 2-mile swim each June as an entry-level event to help newer swimmers get oriented to ocean swimming and get more comfortable swimming longer. The early-season, cold water event honors the vast contributions made by Jim Doty, the legendary open water swimmer who revived the Boston Light Swim in the 1970s after a 30-year hiatus.
The 3.7-mile Egg Rock Scramble, which MOWSA revived in 2024 based on historical newspaper clippings detailing highjinks off Swampscott in the 1930s, further builds confidence and skill as swimmers train for the Boston Light Swim, the English Channel, and other ultramarathon swims.
The group events are certainly fun and community-building, but it could be argued that MOWSA’s biggest contribution to open water comes from its burgeoning slate of solo swim events. MOWSA offers solo swims ranging from 8 miles to 24 miles or more – with a choose-your-own-adventure option that has seen swimmers get creative in recent years. With MOWSA’s support, swimmers have connected lighthouses, circled much-loved islands, and crisscrossed the harbor to their heart’s content. The Boston Harbor Islands are steeped in history and swimmers who wade into those waters undertake a unique challenge that MOWSA is thrilled to support.
MOWSA is equally proud to support Beyond the Breakers and to have the open water swimming world in our backyard for a weekend. We’re pleased to share our knowledge and expertise and to meet and get to know new swimmy friends from all over. The growth of the open water swimming community in recent years has been inspiring and humbling, and MOWSA is very much here for it all and is excited to be a key sponsor of BTB.
Let’s go swimming!