"The Lost World" is a novel written by Sir Arthur Conan Doyle, published in 1912. The story follows a group of explorers, including the famous detective Sherlock Holmes's companion, Professor Challenger, as they journey to a remote plateau in the Amazon rainforest. They discover a prehistoric ecosystem filled with dinosaurs and other ancient creatures, challenging the scientific understanding of evolution. The novel is a blend of adventure and science fiction, highlighting themes of exploration and the clash between modern science and ancient life. It has inspired various adaptations in film, television, and literature, contributing to the enduring fascination with dinosaurs and lost worlds.