The term 'Wine Valley German' refers to the MOSEL region of Germany, which is known for its production of white wines. The MOSEL region is located in the western part of Germany and is home to some of the country's most renowned vineyards. The region is known for its steep slopes and terraced vineyards, which are ideal for producing high-quality white wines. The MOSEL region is also known for its Riesling wines, which are considered to be some of the best in the world.