The Abruzzo region has the Apennines running along its western border and includes Corno Grande, the highest point on mainland Italy. The mountain range serves as a tempering influence on the climate, blocking many storms that come in from the west. However, this does leave the area prone to storm systems originating from the east, which are blocked in their westward progression by the mountains, causing high levels of precipitation to fall on the vineyards, as happened during several rain soaked vintages of the late 1990s.