Gary Sredzienski is making a four-mile swim Saturday between Rye, N.H., and his hometown of Kittery to benefit the Maine-based American Lighthouse Foundation and its local chapter, Friends of Portsmouth Harbor Lighthouses. The swim gets under way at 1 p.m. and is expected to end four hours later.

Sredzienski begins his swim at 1 p.m. at Odiorne Point in Rye with stops at Whaleback and Portsmouth Harbor lighthouses before ending at roughly 5 p.m. at Kittery Point in Maine.

Afterward, Sredzienski — who is an accomplished accordion player — and his band, the Serfs, will play at a celebration party at Captain and Patty’s restaurant in Kittery.