Николаевская железная дорога
The Valdayka flows over the Valdai Hills and is a part of the waterway from Lake Valdayskoye to Lake Ilmen. The source of the Valdayka is in Lake Uzhin, close to the town of Valday. The river flows north-east to Lake Piros. It runs through a number of lakes long and wide, in particular, Lake Zakidovskoye and Lake Plotichno. The Moscow – Saint Petersburg Railway crosses the Valdayka close to the village of Lykoshino. Since the Berezayka flows through the Lake Piros, the Valdayka is considered its tributary.