"Journey to the River Sea" is a children's novel by Eva Ibbotson that follows the story of a young girl named Maia who travels from England to the Amazon rainforest. She is sent to live with distant relatives after the death of her parents. Excited yet nervous, Maia dreams of adventure and discovering the wonders of the jungle. In the Amazon, Maia meets various characters, including Finn, a boy who shares her love for exploration. Together, they encounter the beauty of nature, face challenges, and learn about friendship and courage. The story highlights themes of belonging and the importance of following one's dreams.