India is a quadrilateral-shaped country, bounded by the ocean on the southern and the eastern side. The Indus river forms the western and the north-western boundary of the country, as far as the ocean. India's northern border reaches the extremities of Tauros. From Ariana to the Eastern Sea, it is bound by mountains that are called Kaukasos by the Macedonians. The various native names for these mountains include Parapamisos, Hemodos and Himaos (the Himalayas). Beyond Hemodos, lies Scythia inhabited by the Scythians known as Sakai. Besides Scythia, the countries of Bactria and Ariana border India.