Ransom's most well known book series, "Swallows and Amazons", tells the stories of school-holiday adventures of children. The stories are mostly set in the Lake District and the Norfolk Broads. Many of the books involve sailing. Other common things are fishing and camping. The books are so popular that they give a basis of a tourist industry around Windermere and Coniston Water — the two lakes that Ransome used as the basis for his fictional North Country lake.