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  2. Natural border - Wikipedia

    en.wikipedia.org/wiki/Natural_border

    Expanding until natural borders are reached, and maintaining those borders once conquered, have been a major policy goal for a number of states. For example, the Roman Republic, and later, the Roman Empire expanded continuously until it reached certain natural borders: first the Alps, later the Rhine river, the Danube river and the Sahara desert

  3. Natural barrier - Wikipedia

    en.wikipedia.org/wiki/Natural_barrier

    Natural barriers have been important factors in human history, by obstructing migration and invasion. For example, Jared Diamond argues that West European nations have been the dominant powers of the last 500 years because Europe's many natural barriers divided it into competing nation-states and this competition forced the European nations to ...

  4. Border barrier - Wikipedia

    en.wikipedia.org/wiki/Border_barrier

    A border barrier does not usually indicate the location of the actual border, and is usually constructed unilaterally by a country, without the agreement or cooperation of the other country. Examples of border walls include the ancient Great Wall of China, a series of walls separating China from nomadic empires to the north. The construction of ...

  5. Boundaries between the continents - Wikipedia

    en.wikipedia.org/wiki/Boundaries_between_the...

    (Definitions of "continents" are a physical and cultural construct dating back centuries, long before the advent or even knowledge of plate tectonics; thus, defining a "continent" falls into the realm of physical and cultural geography (i.e. geopolitics), while continental plate definitions fall under plate tectonics in the realm of geology.)

  6. Separation barrier - Wikipedia

    en.wikipedia.org/wiki/Separation_barrier

    A separation barrier that runs along an internationally recognized border is known as a border barrier. [ citation needed ] David Henley opines in The Guardian that separation barriers are being built at a record-rate around the world along borders and do not only surround dictatorships or pariah states.

  7. Boundaries in landscape history - Wikipedia

    en.wikipedia.org/.../Boundaries_in_landscape_history

    The coincidence of another landscape feature with a parish boundary can be used to date that feature—for example in the Time Team episode screened on 11 March 2007, a mill leat was determined to pre-date the Norman conquest because it coincided with a parish boundary.

  8. List of political and geographic borders - Wikipedia

    en.wikipedia.org/wiki/List_of_political_and...

    Below are separate lists of countries and dependencies with their land boundaries, and lists of which countries and dependencies border oceans and major seas. The first short section describes the borders or edges of continents and oceans/major seas. Disputed areas are not considered.

  9. Natural frontiers - Wikipedia

    en.wikipedia.org/wiki/Natural_frontiers

    Natural frontiers is a diplomatic policy that indicates international boundaries and borders should be based on distinct physical features such as coastlines, rivers, mountains, deserts and water basins. This concept originated in France and has been historically used by Paris to justify claims to certain neighbouring territories.