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  2. Border - Wikipedia

    en.wikipedia.org/wiki/Border

    Border conflicts or the potential of such are the reason why many borders feature fortifications and zoning like no man's lands, demilitarized zones, demarcation lines and buffer zones. Examples of border conflicts include skirmishes and wars, such as the 38th Parallel (between North and South Korea), Western Sahara conflict , and Kashmir ...

  3. Mexico–United States border - Wikipedia

    en.wikipedia.org/wiki/Mexico–United_States_border

    The Mexico–U.S. border begins at the Initial Point of Boundary Between U.S. and Mexico, which is set one marine league (three nautical miles) south of the southernmost point of San Diego Bay. The border then proceeds for 227 km (141 mi) in a straight line towards the confluence of the Colorado River and Gila River.

  4. Mason–Dixon line - Wikipedia

    en.wikipedia.org/wiki/Mason–Dixon_line

    A "north line" along the meridian (line of longitude) from the tangent point to the Maryland-Pennsylvania border. Should any land within the 12-mile circle fall west of the north line, it would remain part of Delaware. (This was indeed the case, and this border is the "arc line".)

  5. Boundary marker - Wikipedia

    en.wikipedia.org/wiki/Boundary_marker

    A boundary marker, border marker, boundary stone, or border stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in direction of a boundary. [1] There are several other types of named border markers, known as boundary trees, [2] [3] pillars, monuments, obelisks, and ...

  6. Border irregularities of the United States - Wikipedia

    en.wikipedia.org/wiki/Border_irregularities_of...

    The Northwest Angle in Minnesota, bordering Manitoba, Ontario, and Lake of the Woods. There are several exclaves between the United States and Canada, including the entire state of Alaska (though the state can still be accessed by sea from the United States, except the small settlement of Hyder, which is only accessible by road from British Columbia).

  7. List of river borders of U.S. states - Wikipedia

    en.wikipedia.org/wiki/List_of_river_borders_of_U...

    Kentucky that the state line is the low-water mark of the Ohio River's north shore as of Kentucky's admission to the Union in 1792. [2] Because both damming and natural changes have rendered the 1792 shore virtually undetectable in many places, the exact boundary was decided in the 1990s in settlements among the states.

  8. Maritime boundary - Wikipedia

    en.wikipedia.org/wiki/Maritime_boundary

    The terms boundary, frontier and border are often used as if they were interchangeable, but they are also terms with precise meanings. [6] A boundary is a line. The terms "frontier", "borderland" and "border" are zones of indeterminate width. Such areas form the outermost part of a country. Borders are bounded on one side by a national boundary ...

  9. Territorial evolution of the United States - Wikipedia

    en.wikipedia.org/wiki/Territorial_evolution_of...

    [389] [390] The only change to a land border redefined how the border between the Lake of the Woods and the Rocky Mountains should be considered; previously, the border followed the curve of the parallel between each border monument, while the treaty changed this to straight lines between each monument. Through this, the United States netted a ...