So while the term "Wasgen" continued, for a long time, to refer to the entire range on the west bank of the Rhine, at the beginning of the 20th century, it gradually became restricted to the Alsatian part of the sandstone mountains, whilst the term "Pfälzerwald" ("Palatinate Forest") became increasingly used to refer to the Palatine part. This led to the Palatinate Forest and Vosges being defined as separate and distinct landscapes. However, in recent decades, in the context of European integration (the Schengen Agreement), there has been an increasing trend to regard the entire mountain complex as a single geographical entity again. Evidence of this changed attitude can be seen, for example, in the establishment in 1998 of the first cross-border biosphere reserve, the Palatinate Forest-North Vosges Biosphere Reserve by UNESCO.