 Keltern's primary watercourse is the Pfinz river, whose eastern tributaries flow in a rift parallel to the Upper Rhine Plain.The lowest elevation in the municipality, normalnull (NN), is along the Pfinz at the border with Remchingen while the highest elevation, NN, is found in the east.Keltern's coat of arms was approved by the Federal Ministry of the Interior on 11 July 1973 and generally recalls the viticulture practiced in the municipal area since the 15th century.