Landscape - the external surface of the earth beneath the atmosphere... is merely an outward manifestation of most of the factors at work in the area. - Richard Hartshorne

Although the roots of geography, as a field of study, reach back to Classical Antiquity... its establishment as a modern science was essentially the work of the century from 1750 to 1850. The second half of this period, the time of Humboldt and Ritter, is commonly spoken of as the "classical period" of geography.

So important, indeed, is the use of maps in geographic work, that, without wishing to propose any new law, it seems fair to suggest to the geographer a ready rule of thumb to test the geographic quality of any study he is making: if his problem cannot be studied fundamentally by maps - usually by a comparison of several maps - then it is questionable whether or not it is within the field of geography.

Problems connected with political boundaries have frequently elicited the interest of geographers. In all countries with chronic or acute boundary problems the geographers are drawn into the general discussion, more or less as experts, and in some cases the professional geographer has actually been called upon to assist in the determination and demarcation of boundaries.