Tymfristos is a mountain in the eastern part of Evrytania and the western part of Phthiotis, Greece. The mountain is a part of the Pindus mountain range. The elevation of its highest peak, Velouchi, is 2,315 m. The nearest mountains are Kaliakouda and Panaitoliko to the south, Vardousia to the southeast and the Agrafa mountains to the north. It is drained by the river Spercheios to the east and by tributaries of the Acheloos to the west. The name Velouchi comes from Velos which means arrow, as Aetolian archers were known for harassing invading pre-Christian Celts and Persians with their famous archery. See The Greek and Macedonian Art of War, by F.E. Adcock, 1962.