Final answer:
Dominica is the country with Morne Trois Pitons National Park, which includes the island's second-highest mountain. This park is a UNESCO World Heritage site known for its biodiversity and landscapes.
Step-by-step explanation:
The country with the Morne Trois Pitons National Park, which includes the second highest mountain in Dominica, not the world, is Dominica itself. Morne Trois Pitons is a UNESCO World Heritage site known for its lush landscape and rich biodiversity. Speaking of countries with notable peaks, Mount Kilimanjaro in Tanzania is Africa's tallest at 19,340 feet, and Mount Kenya is the continent's second-highest peak at 17,058 feet. In the Pacific, the Marquesas Islands are known for their high, lush mountains with the highest peak reaching 4,035 feet. Nearby, the Pitcairn Islands are a British Overseas Territory with a very small population.