In an example method, data pertaining to one or more parcels of land to be offered for sale is received at a database module. A computer system determines, for each parcel of land, a respective boundary line defining the parcel of land based on the received data. A graphical map is presented visually on an interactive user interface associated with the computer system. The graphical map includes a visual representation of a geographical region and at least one graphical curve overlaid on the visual representation of the geographical region. The graphical curve indicates, with respect to the geographical region, the boundary line defining a respective one of the parcels of land.