National Geographic : 1933 Jan
THE NATIONAL GEOGRAPHIC MAGAZINE w ierlai rixploraulons, Inc. THE GREAT WALL OF PERU, LIKE THAT OF CHINA, MAY HAVE REPELLED INVASION Across the Santa River delta and up into the hills it twists, crossing dry river beds, climbing sharp ridges, and swooping into valleys. The author and his companions followed it for 40 miles by airplane, yet, they believe, explored only a small portion of its length. Almost certainly it was erected to stem the tide of Inca warriors who once harried the country. At intervals along its sides are sturdy forts.