Jacksonville is the county seat of Duval County and the largest city in Florida by population, anchored on the St. Johns River in the state's northeast corner. Known as the River City, it operates under a consolidated city-county government that covers nearly all of Duval County, giving it a uniquely expansive footprint that reaches from a dense downtown core to suburban neighborhoods, rural preserves, and the Atlantic coast. About one million residents live within that consolidated area. The city's identity rests on the water and the port. The 310-mile St. Johns River flows through Jacksonville, and the city's seaport, along with major military installations including Naval Air Station Jacksonville and Naval Station Mayport, anchor a significant part of the regional economy. Waterways, marshes, lakes, and nature preserves thread through the landscape, and miles of Atlantic beaches lie just east of the river. Jacksonville's neighborhoods are famously distinct. The urban core includes Downtown, LaVilla, Brooklyn, Riverside, Avondale, Springfield, Eastside, and San Marco, while western districts such as Normandy, Ortega, and Panama Park add established residential character. Along the coast, the beach communities of Mayport, Atlantic Beach, Jacksonville Beach, and Neptune Beach offer a different, oceanfront way of life. Duval County Public Schools, one of Florida's largest districts, serves the city, and the transportation network centers on the Interstate 95 and Interstate 10 crossroads, with the Jacksonville Transportation Authority providing bus, monorail, and ferry services. For residents, Jacksonville offers an unusually broad mix: a working port city, a river-and-beach outdoor lifestyle, and a wide range of neighborhoods within a single consolidated government.