Boundaries show the end of one place and the beginning of another.
Boundaries can also be called borders or limits. On a map, boundaries are shown like edges or lines that go around countries and states.
SOME HISTORIC BORDERS
The Great Wall of China is a series of stone and earthen fortifications in China, built, rebuilt, and maintained between the 6th century BC and the 16th century to protect the northern borders of the Chinese Empire from Xiongnu attacks during the rule of successive dynasties.
Hadrian's Wall is a stone and turf fortification built by the Roman Empire across the width of what is now northern England. It began in AD 122, during the rule of emperor Hadrian.
The Berlin Wall was a physical barrier separating East and West Germany. The wall separated the two German states for 28 years and 1 day, from the day construction began on August 13, 1961 until it was dismantled beginning in late 1989, and was considered to be a longtime symbol of the Iron Curtain.
MORE ON BOUNDARIES
Border of Tijuana, Mexico and San Diego, U.S.A.
El Paso, Texas, U.S.A. Ciudad Juarez, Chihuahua, Mexico.
A sign welcoming visitors to the U.S. state of Alabama.
A warning marker at the Canada–United States border at Point Roberts, Washington.
Selfilluminating Border flower pot between Burghausen, Salzach in Germany and Ach in Austria.
Border between the Netherlands and Belgium next to a street café.
The bridge over the Inari River in Karigasniemi, on the border of Finland and Norway.
The "Europe" and "Asia" signs in Atyrau, Kazakhstan. Atyrau is considered by many to be located both in Asia and Europe, as it is divided by the Ural River, which is often considered the boundary between Europe and Asia.
Other kinds of boundaries
Rivers and lakes can also form boundaries between two countries
Can you locate these lakes in the satellite map?
Can you see the Rio Grande in this satellite picture?
Rio Grande in the United States and Río Bravo in Mexico is the third longest river system in the United States and serves as a natural boundary along the border between the U.S. state of Texas and the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas.
Airports and seaports are also classed as borders. Most countries have some form of border control to restrict or limit the movement of people, animals, plants, and goods into or out of the country. In order to cross borders, the presentation of passports and visas or other appropriate forms of identity document is required. To stay or work within a country's borders, foreign people may need special immigration documents or permits that authorise them to do so.
Moving goods across a border often requires the payment of taxes. Animals (and occasionally humans) moving across borders may need to go into quarantine to prevent the spread of exotic or infectious diseases. Most countries prohibit carrying illegal drugs or endangered animals across their borders. Moving goods, animals or people illegally across a border, without declaring them, seeking permission, or deliberately evading official inspection constitutes smuggling.
What else do you know about boundaries?