The U.S. coastline stretches over 12,000 miles, making it one of the longest in the world. It includes the shores of all 50 states, with notable coastlines along the Atlantic Ocean, Pacific Ocean, and Gulf of Mexico. Each region features unique landscapes, from sandy beaches to rocky cliffs. The coastline is home to diverse ecosystems, including wetlands, estuaries, and coral reefs. These areas support a variety of wildlife and are vital for industries such as fishing and tourism. Coastal cities like Miami, San Francisco, and New Orleans play significant roles in the economy and culture of the United States.