TU´THOA(Τουθόα), a river of western Arcadia, flowing into the Ladon, on the confines of Thelpusa and Heraea. It is now called Langádhia, and joins the Ladon opposite to the small village of Renési. (Paus. 8.25.12; Leake, Morea, vol. 2. p. 95, Peloponnesiaca, p. 223.)