The San Andreas Fault is a major geological fault line located in California, USA. It marks the boundary between the Pacific Plate and the North American Plate, where these tectonic plates slide past each other. This movement can cause significant earthquakes, making the fault one of the most studied in the world. The fault stretches approximately 800 miles (1,300 kilometers) from the Salton Sea in the south to Cape Mendocino in the north. It is known for its potential to produce large seismic events, which can have serious impacts on nearby communities and infrastructure. Understanding the fault is crucial for earthquake preparedness.