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Norway-Sweden -

The Svinesund Bridge stretches from Strömstad, Sweden to Halden, Norway. It even has a specific line on the bridge to tell you when you've crossed to the other country!

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Slovakia-Austria-Hungary -

Located in Szoborpark, a sculpture park in Bratislava, this monument is set up as a picnic table. Many of the sculptures use triangles as a theme, representing the three nations coming together. (Photo: Wikimedia/CC BY-SA 4.0)

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Costa Rica-Panama -

A former railroad bridge, you will have to pass through both Costa Rican and Panamanian customs to get through to the other side of this border crossing.

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Brazil-Argentina -

Iguazu Falls is the largest waterfall in the world, and certainly represents a grand international border. While most of the Iguazu River is on Brazil's side, most of the falls are actually in Argentina.

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The Netherlands-Belgium -

A direct contrast to the magnificence that is Iguazu, this portion of the Netherlands-Belgium border is quite tame. It is represented by painted stones that run through the town of Baarle (pictured).

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India-Pakistan -

At the Wagah-Attari border there is a flag lowering ceremony every evening. Crowds form to watch the border guards exchange battle calls and different forms of dance.

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Bahrain-Saudi Arabia -

Standing at 25 km (15.5 mi), the King Fahd Causeway has been around since 1986 (though it has been updated since then). It connects Saudi Arabia to the west with Bahrain to the east.

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North Korea-South Korea -

The Korean Demilitarized Zone divides the Korean Peninsula in two. There are set areas to cross, but much of the zone is made up of natural forests and wetlands with varied wildlife.

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Germany-Poland -

Usedom Island is divided between both Germany and Poland. It is home to beaches, numerous seaside towns, and natural parks.

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Nepal-Tibet -

The natural border to beat all natural borders. Mount Everest forms the border between Nepal and Tibet, with the actual line running straight through its summit.

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Thailand-Laos -

The Third Tao-Lao Friendship Bridge was opened in 2011, and it connects the Nakhom Phanom Province in Thailand with the Khammouane Province in Laos. It is one of four friendship bridges.

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Vietnam-China -

Ban Gioc Falls (also known as Detian Falls) straddle the border between Vietnam and China. It is the largest (though not the tallest) waterfall in Asia.

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Finland-Sweden-Norway -

Known as the Three-Country Cairn, the monument you see today was built in 1926. It's located in Lake Goldajärvi (also known as Lake Koltajauri).

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Haiti-Dominican Republic -

The border between Haiti and the Dominican Republic is distinguished not by a monument, but by their laws. Haiti has fewer laws governing deforestation, so trees (or lack thereof) mark the border.

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Russia-Estonia -

Hermann Castle (in Estonia) and Ivangorod Fortress (in Russia) are separated by the Narva River, which forms the border between the two countries.

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Argentina-Brazil-Paraguay -

Known as the Triple Frontier, the junction where the Iguazu and Paraná rivers meet separates the tips of three different countries.

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Mexico-Guatemala -

Informally known as "lago Internacional" or International Lake," Lake Yichen has buoys that divide it between Mexico and Guatemala. It's located in an ecopark in Tziscao, Mexico.

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Zambia-Zimbabwe -

One of the largest waterfalls in the world, the South African countries of Zambia and Zimbabwe are divided by Victoria Falls.

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Germany-Poland-Czech Republic -

The tripoint of Germany, Poland, and the Czech Republic is marked with flags on each of the three countries. However, there is no customs, as all three countries are part of the EU.

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Asia-Europe -

This monument is one of several in the Ural Mountains that mark the border between Asia and Europe. It is located near the Russian city of Yekaterinburg.

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The Netherlands-Belgium-Germany -

Located on the summit of Vaalserberg, there is a monument to where the Netherlands, Belgium, and Germany meet. It used to serve four countries, before the micronation Neutral Moresnet became part of Belgium.

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France-Switzerland-Germany -

Known as the Dreiländereck, this monument is located in Basel, Switzerland. While the monument is placed on land, the actual tripoint where the countries converge is located in the Rhine River nearby.

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Denmark-Sweden -

The Øresund Bridge helps to connect Copenhagen (Denmark) with the city of Malmö (Sweden). The bridge runs from Malmö to the Danish island of Peberholm, which then turns into the Drogden tunnel to make it the rest of the way.

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Poland-Czech Republic -

Divided by the Olza River, Cieszyn in Poland and Český Těšín in the Czech Republic were actually part of one town until 1920.

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Thailand-Myanmar-Laos -

Known as the Golden Triangle, this area is where the Mekong and Ruak rivers meet. The area is incredibly popular for tourists.

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Italy-Switzerland -

Within the Alps there is a research center called the Margherita Hut. Though technically in Italy, it is located quite close to the international border.

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Egypt-Saudi Arabia -

The Red Sea serves as the border between Saudi Arabia and Egypt. Here you can see the cliffs of Saudi Arabia off in the distance.

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US-Mexico -

An aerial shot of the US-Mexico border shows a clear distinction between the infrastructure of the two countries. The full border extends 3,145 km (1,954 mi) across the southern US.

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US-Canada -

Niagara Falls is assuredly one of the most famous border divides in the world. The actual crossing, however, happens at the Rainbow Bridge nearby. 

See also: How to avoid the biggest tourist traps in Niagara Falls.

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