In winegrowing regions with cold climates, rivers help moderate severely cold temperatures allowing grape growing to take place.
Answer: True.
In cold climates, such as the Mosel Valley of Germany, rivers reflect sunlight and heat during the day, warming vines. At night, they slow the cooling process because water retains heat longer than soil or air. The presence of rivers can make viticulture possible in cold climates where it would otherwise be difficult, if not impossible.