Isiqiwi semvelo seSlagdala, esiyingxenye yomfula iVirserum, sithathwa njengenye yezindawo ezisemgodini ezinamandla kakhulu eSweden.
Lapho ucezu lweqhwa lubuyela emuva eminyakeni engaba ngu-10 000 eyedlule, lo mgwaqo wakhiwa yi-meltwater. Yaletha amatshe nobhuqu emihubheni yeqhwa nasemifantwini. Indawo ngokwayo inenani le-geological. Iphayini likhula ikakhulu emmangweni.
Engxenyeni esenyakatho-ntshonalanga, kunezitshalo eziningi zikaphayini nemijunipha embalwa. Umhlabathi umbozwe ngohlobo lotshani lwezimvu fescue nobuthi obubomvu.