The Santa Ana River is the longest river in Southern California, stretching approximately 96 miles. It originates in the San Bernardino Mountains and flows southwest through several cities, including Riverside and Santa Ana, before emptying into the Pacific Ocean at Huntington Beach. The river plays a crucial role in the region's water supply and flood control. The river's watershed covers about 2,650 square miles, making it an essential resource for agriculture and urban areas. It also supports various ecosystems, providing habitats for wildlife. Efforts have been made to restore and protect the river's natural environment, enhancing its recreational opportunities for residents and visitors.