pikk, 30-50 m kõrgune, järsunõlvaline (10-35 kraadi) tihti väga kitsa harjaga vallilaadne (vallseljak) positiivne pinnavorm, mis on moodustunud liustiku sees jääst veerudega (voolu)sängides voolava sulavee kuhjaval tegevusel
long (from few hundred m to few hundred km) and high (30-50m) winding ridge of weakly stratified sand and gravel which have formed within ice-walled tunnels by meltwater stream which flowed within or under the glaciers. In case of pressurized water within the glacier, may contain well rounded boulders.
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Koosneb segakihilisest liivast ja kruusast, survelise vee puhul võib esineda isegi rahnusid. Pikkus ulatub mõnesajast meetrist mitme kilomeetrini, oosisüsteemid võivad olla kuni mitmesaja km pikkused.
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