Main-Taunus is a Kreis (district) in the middle of Hesse, Germany and is part of the Frankfurt/Rhine-Main Metropolitan Region as well as the Frankfurt urban area. Neighboring districts are Hochtaunuskreis, district-free Frankfurt, Groß-Gerau, district-free Wiesbaden, Rheingau-Taunus. It is the second most densely populated rural district in Germany.