Sytniy Klyuch is a consecrated spring in the village of Bykovka, located in the Vorotynsky district of the Nizhny Novgorod region. It originates from beneath a park hill, where in the 19th and early 20th centuries the estate of Arkadiy Vasilyevich Demidov and his descendants was situated.

The quality of the water from this spring is beyond doubt, and local residents, as well as visitors to the village, willingly use it for drinking. The water from Sytniy Klyuch is so cold and tasty that it can quench both thirst and hunger. Stone troughs filled with this water served as a kind of "refrigerators": milk from the farm was brought here to cool before being sent to the butter factory.

In the 20th century, the chapel was rebuilt but then abandoned, and by the beginning of the 21st century, it had turned into ruins, posing a danger. In 2007, it was decided to improve Sytniy Klyuch. With funds from the district administration and sponsors, a chapel in honor of the Vladimir Icon of the Mother of God and a closed bathing area were built.

Demidov Park has been preserved almost in its original form, with alleys of linden and silver poplar trees. Ponds were created in the lower part of the park. The area around the spring was beautified, and a chapel was constructed.

Every year, on the holidays of the Baptism of the Lord, the day of the Vladimir Icon of the Mother of God, the day of the memory of the holy righteous Prince Peter and Princess Fevronia, as well as the day of the Icon of the Mother of God "Sign," processions are held from the Bykovka church to the spring.