North India is a loosely defined region consisting of the northern part of India. The dominant geographical features of North India are the Indus-Gangetic Plain and the Himalayas, which demarcate the region from the Tibetan Plateau and Central Asia. The term "North Indian" is sometimes used to describe people from Uttar Pradesh and Bihar, often using the term bhaiya (which literally means 'elder brother') in a derogatory sense, though some press reports have contradicted this. In Punjab, people from the same region (Uttar Pradesh and Bihar) are often referred to as Purabias, or Easterners.The Government of Bihar official site places the state in the eastern part of India. Within Uttar Pradesh itself, "the cultural divide between the east and the west is considerable, with the purabiyas (easterners) often being clubbed with Biharis in the perception of the westerners."
North India lies mainly in the north temperate zone of the Earth. Though cool or cold winters, hot summers and moderate monsoons are the general pattern. North India is one of the most climatically diverse regions on Earth. During summer, the temperature often rises above 35 °C across much of the Indo-Gangetic plain, reaching as high as 60 °C in the Thar desert, Rajasthan and up to 49 in Delhi. During winter, the lowest temperature on the plains dips to below 5 °C, and below the freezing point in some states. Heavy to moderate snowfall occurs in Himachal Pradesh, J&K and Uttarakhand. Much of North India is notorious for heavy fog during winters.
North Indian vegetation is predominantly deciduous and coniferous. Of the deciduous trees, sal, teak, walnut, sheesham (Indian rosewood) and poplar are some which are important commercially.The Western Himalayan region abounds in chir, pine, deodar (Himalayan cedar), blue pine, spruce, various firs, birch and junipers.