The San Francisco Bay-Delta is a vital estuarine system located in northern California. It includes the San Francisco Bay, a large tidal estuary, and the Sacramento-San Joaquin River Delta, where the rivers converge and flow into the bay. This area is crucial for water supply, agriculture, and wildlife habitat. The Bay-Delta supports diverse ecosystems and is home to various species, including fish like the Chinook salmon and the Delta smelt. It also plays a significant role in California's water management, providing water to millions of residents and agricultural areas throughout the state.