Without knowing what the "south" is, it is impossible to accurately answer. Several national capitals such as Canberra (Australia) are in the south of their countries.
There are more than a dozen US states that could be considered in the South.
The states and their capitals are:
Jefferson City, Missouri
Little Rock, Arkansas
Frankfort, Kentucky
Nashville, Tennessee
Richmond, Virginia
Raleigh, North Carolina
Columbia, South Carolina
Atlanta, Georgia
Tallahassee, Florida
Birmingham, Alabama
Jackson, Mississippi
Baton Rouge, Louisiana
Austin, Texas
Ottawa is the Canadian capital city located farthest south.
Columbia is the capital city of South Carolina.
The University of South Carolina is located in Columbia, South Carolina.
The capital city located northwest of Beijing is Ulaanbaatar, the capital of Mongolia.
Yes, Pierre, South Dakota is the capital city of South Dakota and is located on the Missouri River.
Bismarck, the capital city of North Dakota, and Pierre, the capital city of South Dakota, are located on the Missouri River.
Columbia is the capital of South Carolina and located on the Conagree River.
There is no capital city called Brazil. There is a capital city called Brazília, which is the capital city of Brazil.
South America. It is the capital of Paraguay.
Harrisburg, the capital city of the Commonwealth of Pennsylvania, is located south of New York State.
Pierre, the capital city of South Dakota.
Phoenix is the state capital and the largest city in Arizona. It is located in the south-central portion of Arizona.