Introduction to the Polei viewing area: This seemingly inconspicuous tree in front of the Tiandao Gate has an extraordinary identity. It is the only tree species in the world, the only one in China, the only one in Hainan, and the only one that exists in Ganshiling. It is called the Polei tree. , a national secondary protected tree species. The wood is tough and durable, particularly resistant to flooding and insect infestation, making it the best tree species in Hainan.