== multiple usage of the same watercourse in two or more entries for longest river: == 

 It stands to reason that one should not be able to use the same stretch of river twice, for if we allow this then many of the first 90 rivers would be 
 1. amazon-ucayali-'little stream A' 
 2. amaxon-ucayali-little stream 'B' and so on for any little streams we can find 
 amonngst the head-waters of the amazon. 

 I propose that the same watercourse (stretch of river) should not be used in two different entries. a glaring example of this is: 
 16.Tocantins–Araguaia 
 and then  
 33. Araguaia 
 where the Araguaia river has been used twice in two different entries. what stops us from finding small tributries of this and addding 34 .. 35 .. etc. 

 the ganges and brahmaputra are ok. they share a delta but are assigned different routes through it. 

 ive had a look and thankfully i cant find any more. ...