A ridge is a long narrow elevation of land, it could be a chain of hills or mountains and it could be on land or in the ocean. The oceanic ridge is a continuous submarine mountain chain that extends about 80,000 km or 50,000 miles through all the world's oceans.

Ridges separate the oceans into distinct basins and some are seismically active (caused by earthquakes). The seismically active oceanic ridge is about 37,00 miles long and extends down along the axis of the entire Atlantic Ocean.