桑加蒙河（San****n River）是伊利诺伊河的一个支流，其流域在美国伊利诺伊州中部，源出尚佩恩县西北部，流向西南，绕迪凯特后西转至州首府斯普林菲尔德，复向北、西流，在比尔兹敦以北汇入伊利诺伊河。全长250英里。

The San****n River is a principal tributary of the Illinois River, approximately 246 miles (396 km) long, in central Illinois in the United States. It drains a mostly rural agricultural area between Peoria and Springfield. The river is associated with the early career of Abraham Lincoln and played an important role in the early white settlement of Illinois, when the area around was known as the "San****n River Country". The section of the San****n River that flows through Robert Allerton Park near Monticello was named a National Natural Landmark in 1971.