The page is from "The Voyages and Adventures of Ferdinand Mendez Pinto" (original Portuguese title: Peregrinação). Ferdinand Mendez Pinto was a 16th-century Portuguese explorer. The text is from an English translation, likely the one by Henry Cogan, first published in 1653. The chapter shown (XXXV) discusses his observations in "Pequin" (an archaic spelling of Beijing).
Wall of Tartaria: This is the historical European name for the Great Wall of China. "Tartary" was the general term Europeans used for the vast Central and Northern Asian lands inhabited by Turkic and Mongol peoples (known as "Tartars") north of China. The wall was the barrier separating China from "Tartary."