Greenland ( old spelling : `` Qagsserssuaq '' ) is a mainland peninsula in central Qassersuaq Peninsula , located in the south-northwestern part of Upernavik Archipelago .
Qassersuaq Peninsula ( old spelling : `` Qagsserssuaq '' ) is a mainland peninsula in northwestern Greenland , located in the south-central part of Upernavik Archipelago .