Shannon Keegan is a 36-year-old American open water swimmer from Derby, Vermont who is an Operations Program Manager with Microsoft. She participated in the In Search of Memphre marathon swim in Lake Memphremagog (Vermont), the S.C.A.R. Swim Challenge stage swim in Arizona, the END-WET 36-mile marathon down the Red River from North Dakota to Minnesota, and the 25-mile In Search of Memphre in 2014.
The Extreme North Dakota Watersports Endurance Test or END-WET, is a 36-mile (57.9 km) mixed-sports event where solo and relay open water swimmers pit themselves against other endurance athletes down the Red River between North Dakota and East Grand Forks, Minnesota in the United States. It is one of the longest marathon swims in the world. The event is organized and directed by Andy Magness.