Megalo Valtos is the main village in the valley of Sellianidros. The river that crosses the eastern outskirts of the villages Lalitio and Diminio draws its main volume of water from the Megalo Valtos area, specifically from the sources of Sia. There, amidst dense plane trees just before the road descends to the sources, you will find the picturesque stone chapel of Agia Paraskevi, built in the early 20th century. The area is idyllic from every perspective: unique natural surroundings perfect for easy hiking, coolness in summer, rich autumn colors, and enchanting views towards the Sellianidros valley. The chapel of Agia Paraskevi, celebrating every year on July 26th, is an essential stop for visitors before descending into the lush paradise of the Sia springs and its hidden secrets!