Tercero is one of the 31 barrios of the municipality of Ponce, Puerto Rico. Together with Primero, Segundo, Cuarto, Quinto, and Sexto, Tercero is one of the municipality's six core urban barrios. It was organized in 1878.

Río Portugués is a river in the municipality of Ponce, Puerto Rico. In the 19th century, it was also known as Río de Ponce. Twenty-one bridges for motor vehicle traffic span Río Portugués in the municipality of Ponce alone. The river is also known as Río Tibes in the area where it flows through barrio Tibes in the municipality of Ponce. Río Portugués has a length of nearly 30 kilometers (19 mi) and runs south from the Cordillera Central mountain range into the Caribbean Sea. The Portugués is one of the best-known rivers in Ponce because of its prominent zigzagging through the city and its historical significance. The river is historically significant because the city of Ponce had its origins on its banks. It was originally known as Río Baramaya. It has its mouth at 17°58′51″N 66°37′26″W. This river is one of the 14 rivers in the municipality.