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However, a recent campaign by African advocacy groups is gaining momentum online as it urges organizations and schools to adopt the Equal Earth projection, which they say more accurately displays the size of the continent of more than 1.4 billion people.

The , the continent's diplomatic organization with 55 member countries, endorsed the campaign last week in what advocates call a major milestone.

Here is what to know about the effort to show Africa's real size to the world.

Africa appears too small on most modern maps

The Mercator map was created in the 16th century by Flemish cartographer Gerardus Mercator. Designed to help European navigators at sea, the map distorted landmasses by enlarging regions near the poles such as North America and Greenland while shrinking Africa and South America.

The 2018 Equal Earth projection is a modern map that follows the Earth’s curvature and shows continents in their true proportions, unlike the distorted Mercator map.

The Mercator projection is still common in classrooms and tech platforms. dropped the widely used projection for a 3D globe when viewed on a desktop browser in 2018, but users can switch back to the old map. The mobile app still defaults to the Mercator projection.

Groups campaign to replace the global map

Two African advocacy groups, Africa No Filter and Speak Up Africa, launched a campaign in April to push schools, followed by international organizations and media outlets, to use the Equal Earth projection, which it says more accurately reflects the true size of Africa.

“Correcting the map is not only an African issue. It is a matter of truth and accuracy that concerns the entire world. When whole generations, in Africa and elsewhere, learn from a distorted map, they develop a biased view of Africa’s role in the world," said Fara Ndiaye, co-founder and deputy executive director of Speak Up Africa.

For non-Africans, a shrunken representation of Africa minimizes its demographic, economic and strategic significance, Ndiaye added.

The African Union endorsed the campaign on Aug. 14, the largest body to sign on to the campaign so far, marking a significant milestone for the “Correct The Map� campaign.

Geographers say the Mercator projection is outdated

Mark Monmonier, a Syracuse University professor of geography, said the Mercator projection is obsolete and geographers have long advised people to not use it as a world map.

“It was a useful navigation tool in the 16th century, because it has straight lines, giving navigators a line of constant direction to sail along," Monmonier said. “But outside of that very narrow navigation application, there is no point in using it."

While maps following the curvature of the earth, like the Equal Earth projection, offer a more accurate scale of the true sizes of the continents, he nonetheless warned that bar graphs remain the best way to compare the sizes of different continents.

“When you put irregularly shaped areas on a flat paper, people are going to have a hard time accurately comparing the size of landmasses," Monmonier said.

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This story has been corrected to show that the name of the campaign is “Correct The Map,� not “Change the Map.�