'Isthmiana' is a travel memoir of author and military man Major Theodore Winthrop. Winthrop travels through the Isthmus of Panama on his way to California and describes the different sights and sounds he encounters on the way. He describes the rich scenery in vivid language that betrays his appreciation of the Panamá jungles. The novel was published in 1863, two years after he was killed in the American Civil War.