Active continental margins are primarily located along the edges of the Pacific Ocean. This is because the Pacific Ocean is surrounded by a ring of fire, where subduction zones are prevalent.

Here's a more detailed explanation:

* Subduction Zones: Active continental margins are characterized by the convergence of tectonic plates where one plate (typically oceanic) is forced beneath another (typically continental). This process is called subduction.

* Pacific Ring of Fire: The Pacific Ocean is surrounded by a region known as the Ring of Fire, where a significant number of subduction zones exist. These zones are responsible for the formation of volcanoes, earthquakes, and mountain ranges along the Pacific Rim.

* Examples: Examples of active continental margins around the Pacific Ocean include the western coast of North and South America, the eastern coast of Asia, and the islands of the western Pacific.

While the Pacific Ocean has the most active continental margins, there are some exceptions, such as the eastern coast of the Mediterranean Sea and the Caribbean Sea.