Final answer:
The country with rivers such as the Usumancinta, Motagua, Polochic, and Río Dulce, as well as the Sarstún, is Guatemala.
Step-by-step explanation:
The country that encompasses the Usumancinta River, the Motagua River, the Polochic River, and the Río Dulce, as well as the Sarstún River, is Guatemala. These rivers are significant geographical features within the nation and contribute to its diverse ecosystems.
The Usumancinta River, for instance, which is one of the most substantial rivers in Central America, serves as a part of the border between Mexico and Guatemala. The Motagua River is the longest river in Guatemala and has historical importance as it traverses regions that were once the heartland of the Maya civilization.