Final answer:
Rio de Janeiro is the southeastern city of Brazil located near 23S, 43W, known for its travel and international business importance.
Step-by-step explanation:
The southeast city of Brazil located near 23S, 43W is Rio de Janeiro. This vibrant city is not only a travel and international business center but also known for its iconic carnival festivities and beautiful coastline, including famous attractions like Copacabana and Ipanema beaches as well as Sugarloaf Mountain. Rio de Janeiro, despite being replaced by Brasilia as the capital in 1960 to promote the development of the nation's interior, remains a vital cultural and economic hub within Brazil's southeastern region.