San Antonio is a large city in southern Texas, USA. It is the second most populous city in Texas, with about 1.4 million people. It is the seventh most populous city in the United States. The city is known for The Alamo, and the River Walk along the small small San Antonio River that flows through the middle of the city. It is lined with shops and restaurants. San Antonio is also home to the San Antonio Spurs, which is a basketball team in the NBA.