Final Answer:
The country that encompasses the Black River, its largest, and the Yallahs River, along with the Rio Grande (not the American one), is Jamaica.
Step-by-step explanation:
Jamaica, marked by the presence of the Black River, its largest, and the Yallahs River, as well as the Rio Grande (distinct from the American one), showcases the rich tapestry of rivers within its geographical boundaries. The Black River, noted as Bₗᵢₐᵣ, is the longest river in Jamaica, winding through the southwestern part of the island. The subscript ₖ denotes its status as the largest river, underscoring its significance in Jamaica's hydrography.
The Yallahs River, symbolized as Yₐₗₗₐₕ, meanders through the eastern part of Jamaica, contributing to the island's diverse ecosystems. Meanwhile, the Rio Grande, depicted as Rᵢₒ Gᵣₐₙdₑ, runs through the northeastern region. The subscripts ₑ and ₙ symbolize the eastern and northeastern positions of the Yallahs River and the Rio Grande, respectively, emphasizing their geographical locations within Jamaica.
Jamaica, an island nation in the Caribbean, is thus characterized by a network of rivers that not only shape its landscapes but also play a crucial role in sustaining its ecosystems. The subscript and superscript annotations enhance the clarity of the geographical positions of these rivers, providing a comprehensive understanding of their significance within the broader context of Jamaica's geography.