Brahmaputra 

1 The Sunderban Delta is the worlds’ largest and the fastest growing delta.

2.  Filled by various tributaries, the river Ganga reaches West Bengal.

3. The Sunderban Delta derived its name the Sundri tree which grows well in marshland.

4. It is also the home of Royal Bengal tiger. 

1. The term drainage means the river system of an area. It is a system of flowing water from the higher level to lower level. 2. Some small streams flowing from different directions come together to form the main river, which ultimately drains in to a large water body.

3. The area drained by a single river system is called a drainage basin. 

1. Water Divide is an elevated area or uplands which separate two drainage basins.

2. Such uplands or elevated areas are known as Water Divide.

3. ‘Ambala’ is located at the water divide between the Indus and Ganga River.

4. It does not receive water from either of the two rivers. 

1. Bhagirathi is the headwater of Ganga which is fed by the Gangotri Glacier. It is joined by the Alknanda at Deveprayag in Uttaranchal.  

2. The Ganga emerges from mountains on to the plains at Haridwar.

3. The Ganga is joined by many tributaries from Himalayas including major rivers such as the Yamuna, the Kosi, the Ghaghara and Gandak.  

4. The Chambal, the Betwa and the Son are the main tributaries coming from the peninsular uplands 

1. The Brahmaputra originates in Tibet east of Mansarowar Lake very close to the sources of the Indus and the Sutlej.  

2. It is joined by many tributaries including the Dibangm the Lohit, the Kenula to form the Brahmaputra in Assam. 

1. The areas along the banks of rivers have witnessed great cultural and economic progress since ancient times. Rivers are integral part of our folklore and folk songs.  

2. Water from the rivers is basic natural resource, essential for human, agricultural and industrial activities.

3. Rivers and their associated alluvial soils provide the most productive agricultural lands of country. Irrigation and generation of hydraulic energy from rivers have been backbone of the development if an economy.

4. Industrial development has flourished along rivers as many industrial processes rely on water-as a raw material, as a coolant and for the generation of hydraulic energy.

5. Rivers provide primary channels of inland transportation, not only directly in the form of navigable waterways. 
 

1. Lakes help to regulate the flow of water.

2. During heavy rainfall it prevents flooding and during the dry season it helps to maintain an even flow of water.

3. Lakes can also be used for developing hydraulic power.

4. Lakes are valuable source of water.

5. Lakes moderate the climate of the surrounding, maintain the aquatic ecosystem, enhance natural beauty, helps to develop tourism and provide recreation.