Designed to acquaint students at Triton Regional High School (Massachusetts) with the importance of the salt marshes and marine environment around Triton, this outdoor education curriculum guide includes three sections emphasizing an interdisciplinary approach to physics, ecology, and history. The unit is designed for 50 students and 5 teachers working in teams during a 4-week period and involving in-class preparation that culminates in a 3-day mapping, study, and camping trek from Triton to Plum Island across the Newbury and Rowley marshes. Each section includes a teacher's and a student's guide as well as a bibliography. The appendices include: a map of the Parker River Wildlife Refuge; a sample parent letter and permission slip; a student evaluation form; and one instrument of general evaluation. Unit objectives framed in team activities involving both students and teachers are identified as follows: cooperating with a team in the achievement of common goals; living on and next to the marsh for 3 days; navigating to and from marked points; mapping a broad transect of the marsh; understanding how the marsh was formed; hearing stories from oral history studies by history students; learning the importance of salt marshes to marine environment as a whole; teaching each other skills learned in preparation for the hike; preparing and presenting a group ecological and historical map of the transect surveyed; sharpening aesthetic appreciation of estuaries; and identifying marsh plants and animals. (JC)