Final answer:
The Ortoire River and the Caroni River are located in Trinidad and Tobago. These rivers are integral to the local environment on the island of Trinidad, the larger of the two islands that make up the nation.
Step-by-step explanation:
The Ortoire River and the Caroni River are both located in the country of Trinidad and Tobago. While South America does have several major rivers like the Orinoco and the Paraná, which flow through different countries across the continent, the Ortoire and Caroni Rivers are specific to the Caribbean island of Trinidad, which is one-half of the nation of Trinidad and Tobago.
The Ortoire River is the longest river on the island of Trinidad, and the Caroni River is notably the second longest. These rivers play a significant role in the island's ecology and are essential to the local environment, supporting a variety of wildlife and ecosystems.