This layer is a georeferenced raster image of the historic paper map entitled: Karte des nördlichen befestigten Theils des Bosphorus : von den Hissaren bis zu den Leuchtthürmen am Schwarzen Meer : im Auftrage Sr. Hoheit Sultan Mahmud II mit dem Messtisch in 1:25,000 aufgenommen 1836-37. It was published by: Simon Schropp & Comp in 1849. Scale 1:25,000. Map in German. The image inside the map neatline is georeferenced to the surface of the earth and fit to the WGS 1982 UTM Zone 35N (EPSG: 32635) coordinate system. All map features and collar and inset information are shown as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of geographies, originators, ground condition dates, scales, and map purposes.