Singhalila National Park is the highest National Park in West Bengal. It is situated in the extreme north western boundary of Darjeeling District and extends. The vegetation of these virgin forests mainly alpine, changes with the range in altitude.
The main tree species found are the Rhododendron, Magnolia, Oak, Hemlock, Silver Fir, Juniper, Mailing Bamboo, Buk, Kawla, Bhujpatra etc. Other flora include primulas, aconitums, gentians, arisaemas and orchids adorning the forest clearings. The fauna found in the park are leopard, serow, pangolin, elephant, chinkara takin, red panda, barking deer etc.
The park has a variety of birds such as pigeons, doves, sibia, minivet, magpie, cuckoo, hornbills, Kaleej pheasants and a large number of migratory birds.
The one day trek from Sandakphu- Phalut about 23km is the best of all the treks. Phalut lies on the borders of West Bengal, Sikkim and the eastern border of Nepal. The best for this trek along the Singalila ridge which passes through desolate hills covered with patches of forest is October and November. At Phalut, one can have real close look at the Kanchedzonga and experience the spectacle of circular rainbows.
From Phalut the way down to Sirikhola on the banks of river Sirikhola, one can see meadows clustered with blue iris, orchids and a further 6km leads to Rimbik, a small village which connects Maneybhanjang and Darjeeling (51km)by road. From Sandakphu one can skip the trek to Phalut and come straight down to Sirikhola through a steep descend via Gurdum (2300m).