The wine-growing regions are mostly concentrated in the south and southwestern part of Germany. Germany is famous primarily for the world-class Riesling produced in its Mosel region. It was the Romans who established the country's first vineyards along the banks of the Mosel, near what is now the town on Trier. The Mosel Valley is a passage way, the Mosel river carved between the low mountain ranges Hunsrück and Eifel, and covers the valleys of its tributaries, the Saar and the Ruwer. It is is one of Germany's most spectacular wine regions shaped by steep terraced vineyards and a slaty soil. Together with its two small tributaries, the Saar and the Ruwer, the Mosel composes one geographical entity. Although each river's vineyard area produces a wine with its own distinctive personality, the three share a family resemblance: a fragrance reminiscent of spring blossoms, a pale color, light body and a refreshing, fruity acidity. They often have the slightest hint of effervescence, which makes them even more charming. High quality Mosel wines are considered as one of the finest whites in the world. Though white wine makes up of most of the wines produced here, top quality German Spätburgunder (Pinot Noir) is now emerging from various regions, particularly Baden, Pfalz and even the tiny Ahr Valley.