The Basque sub-dialect of the vallye, known as Aezkoera, belongs to the High Navarrese dialect but it has strong influence from Lower Navarrese and specially nearby subdialect of Salazar Valley.
They also cross the border to include the dialects or subdialects of the Bulgarian minority in the Western Outlands (the regions of Tsaribrod and Bosilegrad), Bulgarian territories transferred to Serbia by the Treaty of Neuilly as punishment for Bulgarian participation in World War I on the side of the Central Powers.