[1] The Loučná originates in the territory of Karle in the Svitavy Uplands at an elevation of 516 m (1,693 ft).

It flows to Kunětice, where it enters the Elbe River at an elevation of 218 m (715 ft).

[2] The longest tributaries of the Loučná are:[3] The most populated settlements on the river are the towns of Vysoké Mýto and Litomyšl.

The river flows through the municipal territories of Karle, Chmelík, Trstěnice, Čistá, Benátky, Litomyšl, Tržek, Cerekvice nad Loučnou, Hrušová, Vysoké Mýto, Tisová, Zámrsk, Slatina, Dobříkov, Týnišťko, Radhošť, Vraclav, Stradouň, Trusnov, Uhersko, Ostrov, Chroustovice, Moravany, Slepotice, Dašice, Lány u Dašic, Sezemice and Kunětice.

The Loučná is an undemanding river with a slight gradient, suitable for less experienced paddlers.