Rodderberg

The Rodderberg is an extinct volcano in the east of the municipality of Wachtberg near Bonn, Germany.

Together with the Drachenfels directly opposite, the Rodderberg narrows the Rhine valley.

The Rodderberg offers views to the Siebengebirge, the Rhine valley and up to the Cologne Cathedral, about 50 km away.

This happened when the magmatic plume reached the groundwater level of the Rhine (about 50 m higher than today).

After the explosion, the crater was filled with water that formed a maar of about 90 m depth.