Perched in the southernmost outpost of North Eastern India Mizoram is known as the Songbird of the Northeast. The term 'Mizo' is a compound of two words: 'Mi' means man and 'Zo' means hills. Thus Mizo connotes a "hill man". The Mizos also believed that mountains, big trees, huge rocks, swamps and caves were haunted by malevolent spirits and demons which caused suffering to human beings in their own different ways. Orchids are abundant in Mizoram. Epiphytic orchids are greater in number than terrestrial ones. The Palak Lake an abode of aquatic birds with wild duck of different species. From Aizawl, visitors can enjoy the stunning vistas of the lush emerald Tlawng River Valley in the west and the Turial River Valley in the east. Tamdil Lake in Aizawl district is another abode of aquatic fauna consisting of fish and prawns and wild life in the enclosing jungle. Tropical and evergreen forests surround Rangdil Lake. Saiha is an angler's paradise on the Chhimtuipui, Mizoram's biggest river, 378 km from Aizawl. Phawngpui is extremely popular with trekkers and adventure enthusiasts. Fragrant herbs and rare species of orchids and rhododendrons are found in this Blue Mountain.