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 1 Washington restricted a river in South America? Right: Amazon (7)

 5 Fox, at first, moves slowly with birds (7)

 9 Shows perverse sex on banks of Po (5)

10 Yellow duck is sweet (5,4)

11 Wordplay king Hudson’s musical genre (4,4)

12 Rouse sleeper initially, with Tiber winding around (6)

14 Pop’s trouble returning after Schuylkill initiation (4)

15 Peg takes left at Pecos, swimming with compress (9)

17 Physicist lobs bombs in roiling Rhine (5,4)

19 Seine engulfs a spruce (4)

22 Get lost (shucks) within part of India, heading for Yangtze (2,4)

23 A waterfowl, female, that’s seen on the Nile (5,3)

26 Volga sent eddying in Southern port (9)

27 St. Lawrence encircling a nation (5)

28 Where Ural largely exists (toward the west), between the capital of England and the far end of China! (7)

29 Buffalo and ape chewed a bit of Shannon’s beans (7)
 

 1 At Wabash’s source, assist puppy (5)

 2 Dnieper twisted and turned red, perhaps (7)

 3 Introduce fermented resin at head of Tigris (6)

 4 Move wildcat on Loire (10)

 5 Popularity of a Mekong bridge (4)

 6 Bunk and snoop around Enns in flux (8)

 7 With respect to Housatonic, it would be 2/10 for Admiral Nelson (8)

 8 Euphrates nuked to get past the boiling point (9)

13 Arno’s cult I deprogrammed beyond the limits of audibility (10)

14 Ganges you revisited is a place of worship (9)

16 Watch campaign groups on the rise, supporting Delaware’s last fugitives (8)

18 Getting up, tell about the first Amazon, for example (1-6)

20 Final phase named, e.g., “Mystic” (7)

21 City on the Vistula fighting gnome (6)

24 Runs across Mississippi, keeping feet uncovered (5)

25 James backtracking through eastern stretch of Platte (4)
 

 

ACROSS 1 2 defs. 6 B([eg]O)OTH 9 REDO + UBT (but anag.) 10 anag. 11 B + ROOD 12 REIN + STATE 13 hidden 14 PER + SPIRE (rep rev.) 17 ELECT RON 19 anag. 22 RET(ICE)NCE (center anag.) 24 T(H)UDS (dust anag.) 26 AT + TEMP + T 27 F (ACTO) + ID (coat anag.) 28 H(YEN)A (&lit.) 29 2 defs.

DOWN 1 SH + RUB 2 BE DROLL 3 COU(P) D’ETAT (acted out anag.) 4 [w]INTERS 5 ENT + WINED (ten anag.) 6 anag. 7 hidden 8 anag. 13 [r]OVER-R + E-ACH[e] 15 S(KEPT)IC AL 16 TOP + NOT + C[lot]H (ton, pot rev.) 18 anag. 20 anag. 21 DE(A F)EN (need rev.) 23 COMMA[nd] 25 SE(D)ER (&lit.)