The headwater region of the Quayaneri Watershed is part of the Morne Trois Piton National Park, a World Heritage Site that is internationally recognized for its rich biodiversity and unparalleled high-nature value landscape features.

The watershed has a high stream density, steep topography and farming is prevalent in the mid to lower regions. The ecosystem is diverse, with several primitive, endemic, and native plants, and animal and bird species contributing to its rich biodiversity.