The collision between the two ancient land masses has resulted in the formation of a well integrated indian sub continent.It consists of diverse surface features,which may be grouped as follows: 1)The Great Mountain wall of the north 2)The Northern Plains 3)The Great Peninsular Plateau 4)The coastal plains and the islands The Great Mountain wall of the north: In Central Asia not far from India,lies the well known Pamir Knot.It is often called the roof of the world.From this knot run several mountain ranges.One of them is Kunlun which moves east wards into Tibet.Another range that is the Karakoram, enters into Kashmir and runs south east and includes the plateau of Aksai Chuin. The Northern Plains: aaaaNorthern plains of India are made up of the fine silt called alluvium.It is brought down by the rivers from the Himalayas in the north and the peninsular plateau in the south. Such a plain is called an alluvial plain.If you look at the delta of the Ganga Brahmaputra,you will find that this work of deposition is still going on.The Northern plains are divided into two river systems the indus in the west and the Ganga Brahmaputra in the east. The Great Peninsular Plateau: After studying of the young and folded mountains of the North and a much youngerplains to their south,we move further south.It is the oldest structure of the indian sub continent.In fact the slow but steady movement of this landmass towards north and north east has been responsible for the creation of the Himalayas and the Northern Plains in the placeof the Tethys of Geographical plains. The coastal plains and the islands: Deccan Plateau has a coastal strip in the east and the westThe west coastal plain extends from Gujarat to Kerala.The coastal strip along the Arabian sea in the west is Known as Konkan.While as Lakshshadweep Islands,lying opposite to the coast of Kerala are small but numerous.