Explanation:

a high porous land

It is a narrow, porous, northern most stretch of Indo-Gangetic plain. It is about 8-16 km wide running in east-west direction along the foothills (alluvial fans) of the Shiwaliks.
They show a remarkable continuity from the Indus to the Tista. Rivers descending from the Himalayas deposit their load along the foothills in the form of alluvial fans.
These alluvial fans have merged together to build up the bhabar belt. The porosity of bhabar is the most unique feature.