Łyse, Masovian VoivodeshipŁyse is a village in Poland, situated in the Masovian Voivodeship, in Ostrołęka County, and in Gmina Łyse, by the road 645 between Myszyniec and Nowogród.In 1975–1998, Łyse belonged to the Ostrołęka Voivodeship.