The Land That Time Forgot is a fantasy novel by American writer Edgar Rice Burroughs, the first of his Caspak trilogy. His working title for the story was "The Lost U-Boat." The sequence was first published in Blue Book Magazine as a three-part serial in the issues for September, October and November 1918. The complete trilogy was later combined for publication in book form under the title of the first part by A. C. McClurg in June 1924. Beginning with the Ace Books editions of the 1960s, the three segments have usually been issued as separate short novels.

エドガー・ライス・バロウズの本作は、独自の進化論を内包した知的興奮に満ちた傑作です。近代兵器と原始の生態系が衝突する構図は、文明の脆弱さと生命の力強さを鮮烈に突きつけます。読者は疾走感溢れる筆致を通じ、人間が野生へ回帰するスリリングな変容を追体験するでしょう。 映像版は迫力ある死闘が際立ちますが、原作の真髄は生物が段階的に進化する緻密な設定にあります。テキストならではの描写は映像が削ぎ落とした生命の神秘を想起させ、読者の脳内に実写を凌駕する原始世界を再構築します。両者を味わうことで、視覚的衝撃と論理的な深みが融合する至高の体験が叶います。