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Theisoa (Greek: Θεισόα, before 1915: Λάβδα - Lavda) is a mountain village in the municipal unit Andritsaina, Elis, southwestern Greece. Theisoa is situated on a mountain slope above the left bank of the river Alfeios, 3 km southeast of Matesi, 3 km northeast of Rovia, 6 km northeast of connected Andritsaina and 8 km northwest of Karytaina. The Greek National Road 76 (Megalopoli - Andritsaina - Krestena) passes through the village.