The Dong Phayayen-Khao Yai Forest Complex is a UNESCO World Heritage Site located in Thailand. It spans over 2,100 square kilometers and includes several national parks, such as Khao Yai National Park and Dong Phayayen Forest Park. This area is known for its rich biodiversity, housing numerous species of flora and fauna, including endangered animals like the Indochinese tiger and Asian elephant. The complex serves as a vital ecological corridor, connecting various habitats and promoting wildlife conservation. It features diverse ecosystems, from tropical rainforests to grasslands, making it an important area for research and environmental protection. Visitors can enjoy activities like hiking and wildlife watching while appreciating the natural beauty of this unique region.