Sejm

Sejm (nominative singular)
Sejmu (genitive singular)
Sejmowi (dative singular)
Sejm (accusative singular)
Sejmem (instrumental singular)
Sejmie (locative singular)
Sejmie (singular vocative)


Don

Don (nominative singular)
Donu (genitive singular)
Donowi (dative singular)
Don (accusative singular)
Donem (instrumental singular)
Donie (locative singular)
Donie (singular vocative)

Borrowed from Russian Дон (Don), from Old East Slavic Донъ (Donŭ).

Don (a river, the fifth-longest in Europe, in Tula, Lipetsk, Voronezh, Volgograd and Rostov Oblasts, Russia)


Ob

Ob (nominative singular)
Obu (genitive singular)
Obowi (dative singular)
Ob (accusative singular)
Obem (instrumental singular)
Obie (locative singular)
Obie (singular vocative)


Lena

Lena (nominative singular)
Leny (nominative plural)
Leny (genitive singular)
Len (genitive plural)
Lenie (dative singular)
Lenom (dative plural)
Lenę (accusative singular)
Leny (accusative plural)
Leną (instrumental singular)
Lenami (instrumental plural)
Lenie (locative singular)
Lenach (locative plural)
Leno (singular vocative)
Leny (plural vocative)


Dniepr

pl-prop

Dniepr m inan (related adjective dnieprowski or dnieprzański)

dnieprowski (adjective)
dnieprzański (adjective)
Dniepr (nominative singular)
Dniepru (genitive singular)
Dnieprowi (dative singular)
Dniepr (accusative singular)
Dnieprem (instrumental singular)
Dnieprze (locative singular)
Dnieprze (singular vocative)

Dnieper (a river in Belarus, Russia and Ukraine)


Jenisej

Jenisej (nominative singular)
Jeniseju (genitive singular)
Jenisejowi (dative singular)
Jenisej (accusative singular)
Jenisejem (instrumental singular)
Jeniseju (locative singular)
Jeniseju (singular vocative)

Borrowed from Russian Енисе́й (Jeniséj), from Old Kyrgyz Эне-Сай (Ene-Say, “mother river”) or from Evenki Ионэсси (Ionəssi, “big water”).


Niemen

Niemen (nominative singular)
Niemna (genitive singular)
Niemnowi (dative singular)
Niemen (accusative singular)
Niemnem (instrumental singular)
Niemnie (locative singular)
Niemnie (singular vocative)

Borrowed from Russian Не́ман (Néman), from Lithuanian Nemunas, of uncertain origin, possibly from an Old Lithuanian word meaning "damp, wet".

Neman (a river in Belarus, Lithuania and Russia)


Ufa

ufijski (adjective)
Ufa (nominative singular)
Ufy (genitive singular)
Ufie (dative singular)
Ufę (accusative singular)
Ufą (instrumental singular)
Ufie (locative singular)
Ufo (singular vocative)

Ufa (a tributary of Belaya river, Republic of Bashkortostan, Russia)


Abakan

Abakan (nominative singular)
Abakanu (genitive singular)
Abakanowi (dative singular)
Abakan (accusative singular)
Abakanem (instrumental singular)
Abakanie (locative singular)
Abakanie (singular vocative)

Transliteration of Russian Абака́н (Abakán).


Amur

Amur (nominative singular)
Amuru (genitive singular)
Amurowi (dative singular)
Amur (accusative singular)
Amurem (instrumental singular)
Amurze (locative singular)
Amurze (singular vocative)

Borrowed from Russian Аму́р (Amúr), of unknown origin.

Amur (long river forming the border between the Far East of Russia and Northeastern China)


Wołga

Wołga (nominative singular)
Wołgi (genitive singular)
Wołdze (dative singular)
Wołgę (accusative singular)
Wołgą (instrumental singular)
Wołdze (locative singular)
Wołgo (singular vocative)

Borrowed from Russian Во́лга (Vólga), probably from Proto-Slavic *vьlga.


Kamczatka

Kamczatka (nominative singular)
Kamczatki (genitive singular)
Kamczatce (dative singular)
Kamczatkę (accusative singular)
Kamczatką (instrumental singular)
Kamczatce (locative singular)
Kamczatko (singular vocative)

Borrowed from Russian Камча́тка (Kamčátka).

bor+

Kamchatka (a river in Kamchatka Krai, Russia)


Samara

Samara (nominative singular)
Samary (genitive singular)
Samarze (dative singular)
Samarę (accusative singular)
Samarą (instrumental singular)
Samarze (locative singular)
Samaro (singular vocative)

Samara (a tributary of the Volga in Russia)


Łyna

Łyna (nominative singular)
Łyny (genitive singular)
Łynie (dative singular)
Łynę (accusative singular)
Łyną (instrumental singular)
Łynie (locative singular)
Łyno (singular vocative)

Kaliningrad Oblast
Kaliningrad Oblast#English

Łyna (a river in northern Poland as well as in the Kaliningrad Oblast of Russia)


Woroneż

Woroneż (nominative singular)
Woroneża (genitive singular)
Woroneżowi (dative singular)
Woroneż (accusative singular)
Woroneżem (instrumental singular)
Woroneżu (locative singular)
Woroneżu (singular vocative)

Borrowed from Russian Воро́неж (Vorónež), from Old East Slavic Воронажь, Воронѧжь, Воронежь (Voronažĭ, Voronęžĭ, Voronežĭ).

der

Воронажь, Воронѧжь, Воронежь

Voronezh (a left tributary of the Don in Tambov, Lipetsk and Voronezh Oblasts, Russia)


Sym

Sym (nominative singular)
Symu (genitive singular)
Symowi (dative singular)
Sym (accusative singular)
Symem (instrumental singular)
Symie (locative singular)
Symie (singular vocative)


Narwa

Narwa (nominative singular)
Narwy (genitive singular)
Narwie (dative singular)
Narwę (accusative singular)
Narwą (instrumental singular)
Narwie (locative singular)
Narwo (singular vocative)


Pregoła

Pregoła (nominative singular)
Pregoły (genitive singular)
Pregole (dative singular)
Pregołę (accusative singular)
Pregołą (instrumental singular)
Pregole (locative singular)
Pregoło (singular vocative)

Pregolya (a river in Kaliningrad Oblast, Russia)


Tym

Tym (nominative singular)
Tymu (genitive singular)
Tymowi (dative singular)
Tym (accusative singular)
Tymem (instrumental singular)
Tymie (locative singular)
Tymie (singular vocative)

Tym (a river in Russia, a tributary of the Ob)


Sanok

Sanok (nominative singular)
Sanoka (genitive singular)
Sanokowi (dative singular)
Sanok (accusative singular)
Sanokiem (instrumental singular)
Sanoku (locative singular)
Sanoku (singular vocative)

Sanok (a right tributary of the Vorsklytsia in Russia and Ukraine)


Peczora

peczorski (adjective)
Peczora (nominative singular)
Peczory (genitive singular)
Peczorze (dative singular)
Peczorę (accusative singular)
Peczorą (instrumental singular)
Peczorze (locative singular)
Peczoro (singular vocative)

Pechora (a river in the Komi Republic, Russia)