The Zeltinger Sonnenuhr vineyard borders the northern boundary of Wehlener Sonnenuhr. It is a warm, dry site and has a large percentage of old, ungrafted vines. Prüm’s parcel comes from a patch of Alte Reben vines (60 to 70 years old) positioned around the famous sundial. The vines here are said to be the hardest working in the Prüm vineyards, due to the fact that there is so little topsoil—the vines’ roots plunge straight into the bedrock. This makes the wines from Zeltinger some of the most dense and structured in the Prüm range.