With the gradual conquest of southeastern Europe by the Ottomans in the late 14th century, the name of Macedonia disappeared as an administrative designation for several centuries and was rarely displayed on maps. The name was again revived to mean a distinct geographical region in the 19th century, defining the region bounded by Mount Olympus, the Pindus range, mounts Shar and Osogovo, the western Rhodopes, the lower course of the river Mesta (Greek Nestos) and the Aegean Sea, developing roughly the same borders that it has today.