India is bounded by the Arabian Seato the south-west, to the south east by bay of Bengal and Indian Ocean to the south. Kanyakumari constitutes the southern tip of the Indian Peninsula, which narrows before ending in the Indian Ocean.Southernmost part of India is Indira point in the Andaman and Nicobar Islands.The Maldives, Sri lanka and Indonesia are Island nations to the south of India with Sri lanka separated from India by a narrow channel of sea formed by Palk Strait and the Gulf of Mannar. The territorial waters of India extend into the sea to a distance of 12 nautical miles measured from the appropriate baseline. The northern frontiers of India are defined largely by the Himalayan mountain range wher its political boundaries with China, Bhutan, and Nepallie. Its western borders with Pakistan lie in the Punjab Plain and Thar deserty. In the far north east, the Chin Hills andKachin Hills, deeply forested mountainous regions, seprated India from Burma while its political border with Bangladesh is defined by the watershed region of the Indogangetic plain, the Khasi Hills and Mizo Hills.The Ganges is the longest .river originating in India and forms the Indo-gangetoc Plain. the Ganges-Brahmaputra sustem occupies most of northern , central and eastern India, while the Deccan Plateau occupiesmost of southern india. Along its western frontier is the Thar desert, which is the seventh largest desert in the world. Officially india's highest pointis K2 at 8,611m (28,251 ft), though it lies in Gilgit-baltistan , part of disputed kashmir region. Kanchenjunga in Sikkim at 8,598m (28,209 ft)is the highest pt. within India's current geographical boundaries. Climate across India ranges from equatorial in the far bsouth, to Alpine in the upper reaches of the Himalayas.