The image above is a page from da Vinci’s work known as the Codex Atlanticus, describing Armenian Highland with sketches of Armenian mountains and a map of Armenian terrain. The Codex Atlanticus is the largest collection of Leonardo da Vincis papers. Originally gathered together by the sculptor Pompeo Leoni, it is bound in twelve volumes. Its name refers to its large size, being comparable to an atlas.
source : Bridgeman – art culture history