Geography Concept of the Day

Learn a new geography definition each day covering physical geography, human geography, applied geography, and cartography.

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Transcontinental Cities

Istanbul straddles both sides of the 20-mile long Bosporus Strait connecting the Mediterranean and Sea of Marmara (south) to the Black Sea (north). Source: NASAIstanbul straddles both sides of the 20-mile long Bosporus Strait connecting the Mediterranean and Sea of Marmara (south) to the Black Sea (north). Source: NASA

A transcontinental city is a city that exists on land over more than one continent. There are more than a few transcontinental cities in the world. Learn about cities that straddle continental divides.

What are Ghost Nations?

Political map of Transnistria with the differences between the Autonomous Dniestrian Territory de jure and the Pridnestrovian Moldavian Republic de facto. Map: Spiridon Ion Cepleanu, Wikimedia Commons.Political map of Transnistria with the differences between the Autonomous Dniestrian Territory de jure and the Pridnestrovian Moldavian Republic de facto. Map: Spiridon Ion Cepleanu, Wikimedia Commons.

Ghost states are states that function just like any other nation, but for various political reasons go unrecognized by the rest of the international community.

Atmospheric Rivers

Water vapor imagery of the eastern Pacific Ocean from the GOES 11 satellite, showing a large atmospheric river aimed across California. Image from United States Naval Research Laboratory, Monterey. (Captured December 20, 2010).Water vapor imagery of the eastern Pacific Ocean from the GOES 11 satellite, showing a large atmospheric river aimed across California. Image from United States Naval Research Laboratory, Monterey. (Acquired December 20, 2010).

Atmospheric Rivers are trails of moisture in the atmosphere composed of condensed water vapor.

Relief Inversion

Is this a ridge or a canyon? Relief inversion plays tricks on the brain with this image of the Colorado River in Arizona. Photo: NASAIs this a ridge or a canyon? Relief inversion plays tricks on the brain with this image of the Colorado River in Arizona. Photo: NASA

When looking at aerial and satellite imagery, telling the difference between a canyon and a mountain can sometimes be tricky due to an optical illusion known as relief inversion.  Most people have a subconscious interpretation of images based on the assumption that objects are illuminated from above.  We expect the […]