Makalu: The specialties of the Makalu region are the Himalayan endowments of culture and nature. The hidden valleys of the Inkhu and Hongu rivers in Makalu–Barun National Park and Conversation Area lie on the wild side of Sagarmatha. The park spreads over the districts of Sankhuwasabha and Solukhumbu in northeast Nepal and is marked by the Nepal Tibet border in the north.  The park boasts of 47 species of orchids, 67 species of medicinal herbs, 25 of Nepal's 30 varieties of rhododendron, 19 bamboo species, 15 oak species, 48 species of primrose and 86 species of fodder trees. The park also offers bird-watching opportunities with its 400 species of birds, including the rare spotted wren babbler and the olive ground warbler. Wildlife include the endangered red panda, snow leopard, Himalayan black bear, clouded leopard tops, ghoral, tahr, wild boar, barking deer, Himalayan marmot, weasel, langur monkey and serow. River Arun that flows through the park has 84 varieties of fish including salmon.