The Lost Continent (originally Beyond Thirty) by Edgar Rice Burroughs is a science-fiction adventure following Lieutenant Jefferson Turck of the Pan-American Navy. After crossing the forbidden 30th meridian, he discovers a Europe fallen into barbarism and ruin. As he navigates this dangerous, forgotten world, Turck encounters lost civilizations , savage tribes, and unexpected alliances. The novel combines Burroughs’s signature action and imagination with themes of war, societal collapse, and exploration.