HONNEF, a town and climatic health resort of Germany, beautifully situated on the right bank of the Rhine, at the foot of the Siebengebirge, 8 m. above Bonn by the railway Cologne-Königswinter-Horchheim. Pop. (1905) 6183. It has an Evangelical and a Roman Catholic church, a sanatorium for consumptives, and does a considerable trade in wine. The town is surrounded by vineyards and orchards, and has annually a large number of visitors. A mineral spring called the Drachenquelle is used both for drinking and bathing.