<P> The Rann of Kutch is a marshy region located in northwestern Gujarat and the bordering Sindh province of Pakistan . It occupies a total area of 27,900 km (10,800 sq mi). The region was originally a part of the Arabian Sea . Geologic forces such as earthquakes resulted in the damming up of the region, turning it into a large saltwater lagoon . This area gradually filled with silt thus turning it into a seasonal salt marsh . During the monsoons, the area turn into a shallow marsh, often flooding to knee - depth . After the monsoons, the region turns dry and becomes parched . </P> <P> Based on the Köppen system, India hosts six major climatic subtypes, ranging from arid desert in the west, alpine tundra and glaciers in the north, and humid tropical regions supporting rainforests in the southwest and the island territories . The nation has four seasons: winter (January--February), summer (March--May), a monsoon (rainy) season (June--September) and a post-monsoon period (October--December)' . </P> <P> The Himalayas act as a barrier to the frigid katabatic winds flowing down from Central Asia .' Thus, North India is kept warm or only mildly cooled during winter; in summer, the same phenomenon makes India relatively hot . Although the Tropic of Cancer--the boundary between the tropics and subtropics--passes through the middle of India, the whole country is considered to be tropical . </P> <P> Summer lasts between March and June in most parts of India . Temperatures can exceed 40 ° C (104 ° F) during the day . The coastal regions exceed 30 ° C (86 ° F) coupled with high levels of humidity . In the Thar desert area temperatures can exceed 45 ° C (113 ° F). The rain - bearing monsoon clouds are attracted to the low - pressure system created by the Thar Desert . The southwest monsoon splits into two arms, the Bay of Bengal arm and the Arabian Sea arm . The Bay of Bengal arm moves northwards crossing northeast India in early June . The Arabian Sea arm moves northwards and deposits much of its rain on the windward side of Western Ghats . Winters in peninsula India see mild to warm days and cool nights . Further north the temperature is cooler . Temperatures in some parts of the Indian plains sometimes fall below freezing . Most of northern India is plagued by fog during this season . The highest temperature recorded in India was 51 ° C (124 ° F) in Phalodi, Rajasthan . The lowest was − 45 ° C (− 49 ° F) in Kashmir . </P>

Which is the largest physiographic division of india