Rottorf am Klei is a small village in the district of Helmstedt in Lower Saxony. Rottorf am Klei belongs to the municipality of Rennau and the joint municipality of Grasleben.
The village lies north-west of Helmstedt in the Elm-Lappwald Nature Park and is the south-easternmost tip of the Hasenwinkel.
The former "Ernst-August" open-cast mine is located near Rottorf am Klei, where iron-rich marine sediments were mined as calcareous aggregate ore. Operations ceased in 1950. The rock is generally rich in fossils and contains remains of shells (including Gryphaeids), spines of lance sea urchins as well as ammonites and belemnites.
Directions: From Königslutter heading north on Wolfsburger Straße to the Beienrode junction. Cross the motorway to the junction and follow the L 294 south/east to Rottorf. Follow the signs.