What is the fine-grained topic of the following text: In 1976-77 a handful of teenage boys and young teachers reenacted as 17th century voyageurs the 3,300-mile canoe journey in 1681-82 of the Sieur de La Salle from Montreal to the Gulf of Mexico. Only return the topic.
Reenactment of Sieur de La Salle's 17th century canoe journey from Montreal to the Gulf of Mexico by a group of teenage boys and young teachers in 1976-77.