It seems like you might be asking about the Pacific Ring of Fire, which is not a mountain range, but a zone of intense seismic and volcanic activity. Here are 3 mountain ranges within the Pacific Ring of Fire:

1. Andes Mountains: These mountains stretch along the western edge of South America, formed by the subduction of the Nazca Plate beneath the South American Plate.

2. Cascade Range: Located in the western United States and Canada, the Cascade Range is formed by the subduction of the Juan de Fuca Plate beneath the North American Plate.

3. Japanese Alps: A mountain range in Japan, the Japanese Alps are formed by the collision of the Eurasian Plate and the Philippine Sea Plate.

The Pacific Ring of Fire is where most of the world's earthquakes and volcanic eruptions occur, due to the interaction of tectonic plates in this region.