the ponsul river is a affluent of the tejo river, in portugal, and is a very large river. at this time it is completely dry, witho

affluent arid background barren bed boat bridge change changes clay climate completely crack cracked deluge disaster drought dry due earth ecology education environment erosion flood global ground hot its lake land landscape large nature pattern ponsul portugal rain reflection river riverbed rough soil surface sustainability sustainable tejo texture this time torrent tourism very water weather wet