Countries The Prime Meridian Passes Through

Countries the Prime Meridian Passes Through The prime meridian, also known as the Greenwich meridian, is the imaginary line of 0° longitude that divides the Earth into the Eastern and Western hemispheres. While it is most famous for its role in defining Coordinated Universal Time (UTC) and global time zones, the line also cuts across several nations, touching land, sea, and even a few islands. Understanding which countries the prime meridian passes through offers a fascinating glimpse into geography, history, and the way humans have organized the planet for navigation and timekeeping.

What Is the Prime Meridian?

The prime meridian was established at the Royal Observatory in Greenwich, London, in 1884 during the International Meridian Conference. Delegates from 25 countries agreed that the meridian passing through the observatory’s transit circle would serve as the universal reference point for longitude. From that decision, the line was fixed at 0° longitude, and all other longitudes are measured east or west of it.

Because the Earth is a sphere, the prime meridian is not a static feature tied to a single point on the surface; it is a great circle that extends from the North Pole, through Greenwich, across the equator, and down to the South Pole. As it travels, it intersects various landmasses and bodies of water, giving us a list of countries that lie directly on this zero‑longitude line.

Countries the Prime Meridian Passes Through

Below is a detailed look at each sovereign state (and a few territories) that the prime meridian crosses. The line’s path is described from north to south, noting the specific regions or landmarks where the meridian makes landfall.

1. United Kingdom

• Region: England
• Details: The meridian enters the UK at the North Sea, passes through the town of Pevensey in East Sussex, continues through London (crossing the Royal Observatory in Greenwich), and exits near Lewes before heading back out to the English Channel. The Greenwich Observatory remains the symbolic home of 0° longitude.

2. France

• Region: Normandy and Île-de-France
• Details: After leaving the UK, the line crosses the English Channel and hits the French coast near Le Havre. It then traverses the Seine valley, passes just west of Paris (the meridian actually runs through the western suburbs, including Saint‑Denis), and continues southward through the Centre-Val de Loire region before exiting into the Atlantic Ocean near La Rochelle.

3. Spain

• Region: Galicia, Castile and León, Extremadura, Andalusia
• Details: The prime meridian re‑enters Europe at the Rías Baixas in Galicia, cuts across the Meseta Central, skirts the city of Salamanca, and passes through Extremadura (near Mérida). It then moves through Andalusia, crossing the Guadalquivir River near Seville, before leaving the Iberian Peninsula into the Mediterranean Sea near Almería.

4. Algeria

• Region: Northern Sahara
• Details: After crossing the Mediterranean, the meridian strikes the Algerian coast at Ras el Ma (near Annaba). It then travels southward across the Tell Atlas, passes through the Saharan Plateau, and exits the country near the town of In Salah in the central desert.

5. Mali

• Region: Sahel and Sahara
• Details: The line enters Mali near the town of Tessalit in the far north, crosses the Adrar des Ifoghas massif, and continues south through the Sahelian zone, passing close to the historic city of Timbuktu. It exits Mali near the border with Burkina Faso, just east of the town of Gourma-Rharous.

6. Burkina Faso

• Region: Northern Burkina Faso - Details: The prime meridian clips the extreme northern tip of Burkina Faso, passing near the town of Dori in the Sahel region. The crossing is brief, as the line quickly re‑enters Mali before heading further south.

7. Ghana

• Region: Southern Ghana
• Details: After traversing the Atlantic Ocean, the meridian reaches the Ghanaian coast at Half Assini in the Western Region. It then moves inland, passing through the Western North region (near Bibiani), continues through the Ashanti region (close to Obuasi), and exits the country near the Volta River in the Eastern Region, close to Koforidua.

8. Togo

• Region: Southern Togo
• Details: The line enters Togo from Ghana, crossing the Mono River near the town of Bassar. It travels a short distance through the Plateaux region before exiting into the Atlantic Ocean near the town of Aného.

9. Benin - Region: Southern Benin

• Details: The prime meridian clips the southwestern corner of Benin, passing just east of the town of Grand-Popo and crossing the Ouémé River near Porto‑Novo. The crossing is relatively short before the line re‑enters the Atlantic.

10. Nigeria

• Region: Southern Nigeria
• Details: After leaving Benin, the meridian re‑enters Africa at the Nigerian coast near Badagry in Lagos State. It then cuts through Lagos State, passes just east of Ibadan in Oyo State, continues through Ekiti and Kogi states, and exits the country near the River Niger in Delta State, close to the town of Agenebode.

11. Atlantic Ocean (Equatorial Crossing)

• Note: The prime meridian crosses the equator in the Atlantic Ocean, south of Ghana and north of Gabon. This point is often used as a reference for global coordinate systems but does not belong to any sovereign state.

12. Antarctica - Region: Queen Maud Land

• Details: The line continues southward across the Southern Ocean and reaches the Antarctic continent at the Princess Astrid Coast in Queen Maud Land. Although no country has permanent sovereignty over Antarctica, several nations (including Norway, South

The prime meridian’s journey through Africa and beyond underscores its role as a unifying yet arbitrary construct that bridges continents, cultures, and histories. From the sun-scorched dunes of the Adrar des Ifoghas to the icy expanses of Queen Maud Land, the line threads through landscapes as diverse as the human stories they hold. In Mali, it traces ancient trade routes and Timbuktu’s golden age; in Burkina Faso, it glances at the resilience of the Sahel’s communities. Ghana’s coastal towns and Nigeria’s bustling cities reflect the meridian’s passage through hubs of commerce and colonial history, while its fleeting touch in Togo and Benin highlights the fluidity of political boundaries. The Atlantic crossing, though devoid of land, marks a symbolic midpoint between the Northern and Southern Hemispheres, a reference point for sailors and scientists alike. Finally, in Antarctica, the line vanishes into a realm governed by treaty rather than sovereignty, a reminder of humanity’s shared stewardship of the planet.

The prime meridian’s path is more than a geographical curiosity—it is a testament to humanity’s quest for order in a chaotic world. Established at the 1884 International Meridian Conference, it resolved centuries of competing claims, standardizing timekeeping and navigation. Today, it anchors global systems like GPS and UTC, enabling everything from air travel to international finance. Yet its route also reveals the politics of cartography: it bisects nations, divides ecosystems, and occasionally sparks debates over territorial identity. For instance, its passage through southern Nigeria intersects with the Niger Delta’s oil-rich complexities, while its alignment with Ghana’s coast intersects with the region’s colonial past and vibrant present.

Ultimately, the prime meridian is both a product of human convention and a tool of global coordination. It divides the world into east and west, past and present, but also connects them through a shared framework of measurement. As climate change and globalization reshape our relationship with geography, the prime meridian endures as a quiet yet vital thread in the tapestry of Earth’s interconnected systems—a line on a map that continues to define how we navigate, understand, and unite our world.