The following is an image of the current topography surrounding the site of the Ash Lawn-Highland plantation. The dark line drawn around Ash Lawn in this image represents an area roughly equal to the 1,000 acres first acquired by Monroe. This area is outlined to give you an idea of the size and general boundaries of Monroe's initial acquisition, but it is not accurate in detail. This property was bounded on the north by Thomas Jefferson's Monticello, and on the south by Massey Creek and a line running up that creek to the top of what is now called Carter's Mountain.
As can be seen from such topographic maps, the Universal Transverse Mercator Coordinates for the Ash Lawn-Highland property are 17.723000.4206000. It is located at 375854N latitude an 0782722W longitude, four miles to the southeast of Charlottesville, off State Routes 53 and 795, and to the south of Monticello (MacCullough and Siegel 1979).