Among the largest springs in the Voronezh Region, there is a source located between the Serdyuki farmstead and the abandoned Klyuchi farmstead at the foot of a chalk mountain. "Klyuchi", another name is Serdyukovsky Klyuch. The spring is located on the southern outskirts of the Serdyuki farmstead near the disappearing Klyuchi farmstead. The spring was consecrated in the name of the Holy Blessed Matrona of Moscow and Xenia of Petersburg on the feast of the Baptism of the Lord in 2018.
In common parlance, this place is called Serdyukovsky Klyuch or Klyuchi. The water comes out at the foot of the chalk slope. Seven streams flowing out of the chalk layer merge into one reservoir, from which the stream begins. After 3.5 km, it flows into the Potudan River. The activity of the spring is about 20 liters per second.
In 2017, a beautiful wooden closed bathhouse with a font, topped with a dome with a cross, was built at the spring. Water outlets were cleared, the area around the spring was fenced, and places for rest were provided.