Re: *ap-/*up-/*ip- , rivers in -r
--- In firstname.lastname@example.org
, "whetex_lewx" <whetex_lewx@...>
> I know that "ura" in Basque is water.
Actually "the water"; -a is the postponed definite article. Water
BTW, Old High German has the variants ur-, ar-, ir- (er-) of the
preverb/preposition ur- < *uds-, ur- and ar- occuring in the same
verbal noun and finite forms of the same verb (Grimm's Wörterbuch).
Besides High German 'ab' and 'aber' (originally "again") and Low
German 'up' -> auf, + über, Gothic has 'ip-dalja'. /u/,/a/,/i/
again; very un-IE.