This map, oriented with North at the top, depicts the eastern region of Ecuador and its intricate river systems. Rendered in black ink on an off-white background, the topography is defined by heavy, dark hachure marks on the left side representing the high peaks and ridges of the Andes Mountains. From these mountains, numerous thin, winding lines representing rivers flow eastward across a vast, relatively flat plain toward the Brazilian border. In the upper right, the large-scale text reads "LA REGION ORIENTAL DEL ECUADOR" above the smaller text "Escala 1 : 2000000". A faint grid of latitude and longitude lines overlays the entire map, with numerical coordinates marked along the borders. Small, block-letter labels identify various geographical features, settlements, and neighboring territories, including "BRASIL" in the lower right and "PERU" along the bottom. The right margin features a vertical color calibration strip with squares of blue, cyan, green, yellow, red, magenta, white, and black.