The Phra Nang Ruar Lom Chedi was built in 1881 CE by King Chulalongkorn (Rama V, b. 1853 - 1910) in memory of Queen Sunantha Kumarirat who was killed in a boating accident on the Chao Phraya River. Namtok Phlio National Park was designated a national park in 1975 and originally called Khao Sa Bap National Park. It covers an area of 135-sq km (52-sq miles) and contains some of Thailand's lushest rainforest. Wildlife within the park includes 32 species of mammals and 156 species of birds. Barking deer, tiger, leopard and Asiatic black bear are among its larger inhabitants.