Mosel is a wine region in Germany, and enjoys a continental climate with cool temperatures. The best vineyards are along the Mosel River where the sun is maximized as it reflects from the water. The south and southwest slopes are even more attractive because of direct sunlight. The soil is porous making it excellent for drainage during heavy rainfall. Some vineyards have no topsoil, just broken up slate. The region includes the Ruwer and Saar Rivers and is centered around Trier. The Middle Mosel is the predominant wine region. Mosel is the third largest wine region in Germany, but is the most prestigious. Known for its steep slopes, the region is mostly famous for wines that are produced from the Riesling Grape, but Muller-Thurgau and Elbling also contribute to production. The Riesling wines that are produced in the area are usually low in alcohol, crisp, light, and high in acidity. These wines can often exhibit flowery aromas, rather than fruity. Because of the steep riverbanks in the Mosel region, mechanical harvesting is nearly impossible, and requires almost seven times more man-hours during the harvest season. The vines are staked individually and horizontal rather than vertical.  During the winter, the soil often erodes from heavy rain.