Titisee is a lake in the southern Black Forest in Baden-Württemberg. It is said it got its name from Roman Emperor Titus. It covers an area of 1.07 km² and has an average depth of 20 m. It owes its creation to the Feldberg glacier, the moraine ploughed up by which in the Pleistocene epoch nowadays forms the lake's shores. The lake's outflow, at 840 m above sea level, is the river Gutach (or as it is called farther downstream, the Wutach).