Length

European River

3,530 km

Volga

2,857 km

Danube

2,428 km

Ural

2,201 km

Dnieper

1,967 km

Kama

1,870 km

Don

1,809 km

Pechora

1,685 km

Northern Dvina  Sukhona

1,504 km

Oka

1,430 km

Belaya

1,362 km

Dniester

1,314 km

Vyatka

1,233 km

Rhine

1,130 km

Vychegda

1,130 km

Desna

1,094 km

Elbe

1,053 km

Donets

1,047 km

Vistula

1,020 km

Daugava

1,010 km

Neva  Volkhov

1,007 km

Tagus

1,006 km

Loire

992 km

Sava

979 km

Khopyor

966 km

Mezen

966 km

Tisza

953 km

Prut

950 km

Meuse

918 km

Ufa

914 km

Neman

910 km

Ebro

906 km

Kuban

897 km

Douro

889 km

Vetluga


Length

European River

863 km

Manych  Kalaus

857 km

Southern Bug

854 km

Oder

852 km

Guadiana

841 km

Sura

812 km

Rhône

810 km

Bug

808 km

Warta

806 km

Vuoksi  Pielinen

802 km

Kuma

798 km

Sakmara

798 km

Sal

789 km

Mureș

779 km

Pinega

777 km

Seine

761 km

Pripyat

756 km

Göta  Klar

751 km

Weser  Werra

748 km

Seym

748 km

Medveditsa

717 km

Psel

710 km

Drava

686 km

Klyazma

680 km

Onega  Svid

678 km

Svir  Vodla

675 km

Great Irgiz

663 km

Usa

659 km

Horyn

657 km

Guadalquivir

656 km

Moksha

652 km

Po

650 km

Great Uzen

648 km

Sozh


Length

European River

647 km

Narva  Velikaya

647 km

Siret

638 km

Little Uzen

623 km

Terek

619 km

Glomma

615 km

Olt

613 km

Berezina

605 km

Vashka

602 km

Garonne

594 km

Samara

592 km

Chusovaya

575 km

Vaga

574 km

Luza

574 km

Yug

571 km

Ik

565 km

Tornio  Abiskojokk

554 km

Kymi (Rautalammin route)

552 km

Kemi

549 km

Inhulets

549 km

Moselle

549 km

Ay

546 km

Kolva

542 km

Dal  Österdal

535 km

Dyoma

531 km

Izhma

531 km

Unzha  Kema

530 km

Lovat

525 km

Main

520 km

Voronezh

519 km

Inn

515 km

Maritsa

514 km

Marne

510 km

Neris


River: A body of water which has, according to the abovementioned source, no connection (arrow) to another.
River system: A system which consists of at least two rivers. There are, however, requirements for this:
A river system has been assumed if it has
1. its source in a lake which is fed by a river of another name (e.g. Göta River > Lake Vänern > Klar River)
2. its source at the confluence of two rivers, then following the longer one (e.g. Weser > Werra)
3. headwaters bearing the same name (e.g. Sava Dolinka > Sava)
This in return means, that a longer tributary joining the main river later somewhere along its way is NOT considered a river system (e.g. Volga > Oka or Havel > Spree)
An exception has been made for the Western Bug, which joins the Narew shortly before flowing into the Vistula. It would’ve otherwise been isolated from the remaining rivers.
Estuaries are included in river length (Elbe, Garonne, Southern Bug).
Sludge, gunk, any fowl indiscernible substance actually (like stuff from a clogged sink). (so not actual crap, cause you know what that is)
Abstract it can mean crap, shit (as in crappy weather, I did shit on my exam) stinks, bad, failure
We do have the verb pruttelen, which is mainly used for the sound of a coffeemachine, but could also be used for an engine or, if it is em ... a serial fart... ow and soup boiling.
Basicly anything that sounds like many fast blublublublbub
Otherwise, it is a really good quiz. Congrats!
More continents are scheduled to follow later