"Upper Hungary is the usual English translation of Felvidék (lit.: "Upland"), the Hungarian term for the area that was historically the northern part of the Kingdom ...
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of Hungary, now mostly present-day Slovakia. The region has also been called Felső-Magyarország (lit: "Upper Hungary", Slovak: Horné Uhorsko).
During the Habsburg–Ottoman wars, Upper Hungary meant only the northeastern parts of the Hungarian Kingdom. The northwestern regions (present-day western and central Slovakia) belonged to Lower Hungary. Sometime during the 18th or 19th centuries, Upper Hungary began to imply the whole northern regions of the kingdom." - (en.wikipedia.org 16.03.2020)