Topography The town of Nainital covers a total area of , and is located at , at an average elevation of above sea level. The slopes of the nearby mountains are most populated, with an altitude ranging from . The highest point nearby is the Naina Peak, with a height of . The town is located in the
Kumaon foothills of the outer
Himalayas at a distance of from the state capital
Dehradun and from
New Delhi, the capital of India. The town is set in a valley around the
Nainital Lake - an eye-shaped lake, which is located at an altitude of from sea level. The lake is long and wide, and is approximately two miles in circumference. The bed of the lake is at a depth of , the deepest point of the lake. The lake is deduced to have been formed
tectonically. Balia Nala, which is the main stream feeding the lake is along a
fault line and the subsequent streams align parallel to major
joints and
faults. 26 major drains feed the lake including the 3 perennial drains. Nainital is surrounded by the mountains of Ayarpata (), Devpata (), Handibandi (), Chini, (), Alma (), Lariya Kanta () and Sher ka Danda (). Another heavy landslip occurred on 17 August 1898 outside the Nainital valley.
Climate Nainital experiences a
subtropical highland climate (
Cwb) according to
Köppen–Geiger climate classification system as the town's climate is influenced by the elevation. The town is a bit dry during winter and very wet during summer due to
South Asian monsoon system. The lowest precipitation total occurs in November with total , while the highest precipitation total occurs in July with total . Like most places in
temperate region, Nainital has a relatively cool summer. The hottest month is July with temperature ranging from to , while the coldest month is January with temperature ranging from to . The highest temperature ever recorded in Nainital was recorded on 18 June 1972, while the lowest temperature was recorded on 17 January 1953. The trees and bushes grown in the region (lake's basin) with their botanical and common Indian names (in parentheses) are:
Quercus leucotrichophora Oak (Banj),
Aesculus indica (Pangar or Horse chestnuts),
Juglans regia (Akhrot or walnut),
Populus ciliata (Hill Pipal, a sacred tree),
Fraxinus micrantha (Ash tree or Angu),
Platanus orientalis (Chinar),
Rubus lasiocarpus (Hisalu),
Rosa moschata (Kunj or Musk rose),
Berberis asiatica (Kilmora),
Cupressus torulosa (Surai or
Himalayan cypress),
Rhododendron arboreum (Buruns),
Cedrus deodara (Deodar),
Salix acmophylla (
Weeping Willow), and
Pinus (Pine). Several species of medicinal flora and horticulture plants have also been found in the lake. The Aquatic Macrophytic vegetation include
Potamogeton pectinatus,
Potamogeton crispus,
Polygonum glabrum,
Polygonum amphibium and
Polygonum hydropiper (
Water pepper). The fishes found in the lake are generally
carps Mahseer, and the
mirror carp which breed several times during one spawning season during May to September. Two species of Mahaseer fish viz., Tor tor: The red finned
mahseer and the
Tor putitora: The yellow finned
mahseer, a food fish which grows to varying sizes from 20 to 60 cm (7.87 to 23.62 inches) are found. Three species of Hill Trout are found in the lake: the
Schizothorax sinuatus,
Schizothorax richardsoni and
Schizothorax plagiostornus. The imported fish bred in the lake is Mirror carp or
Cyprinus carpio.
Gambusia affinis also called Mosquitofish has been introduced in the lake as a biocontrol measure to control
Mosquito larvae. ==Demographics==