Fill in the Blanks RiversOnline version Información sobre los ríos by Sabela Rivas 1 A river is that flows over the ground . Rivers begin in areas , such as , where rain , water or snow get collected . This place is called the . A river is formed when many merge together . During their journey , rivers grow beacause they collect water from other . Rivers end in areas , generally big bodies of water , such as seas , lakes , oceans or another river . This place is called the .