Spaso-Sumorin Monastery, formerly a male Orthodox monastery in Totma, is located on an elongated cape between the rivers Pesya Denga and Kovda. By decree of the President of Russia on February 20, 1995, the ensemble of the monastery from the 18th-19th centuries was recognized as a cultural heritage site of federal significance.

The monastery was founded in 1554 and named after the Spaso-Transfiguration Church and its founder, the venerable Theodosius of Sumorin, who was canonized as Theodosius of Totma. Theodosius Sumorin was born in Vologda around 1530 and, upon reaching maturity, decided to dedicate his life to God, taking monastic vows at the Spaso-Prilutsky Monastery. The monastery was actively engaged in the salt trade, evaporated in Totma. Theodosius was sent to Totma to oversee salt production and in 1554 founded a new monastery on the banks of the Pesya Denga River. He appealed to Moscow for the abolition of the salt tax and in 1555 received the corresponding charter from Tsar Ivan IV. Spaso-Sumorin Monastery soon became one of the wealthiest Orthodox monasteries along the Sukhona River, although until the end of the 18th century its buildings were predominantly wooden. The existing architectural monuments were built later than the churches in the city center. It is unknown how long the structures erected by Theodosius stood.

Before the 1917 revolution, the relics of the venerable Theodosius were kept in the Resurrection Cathedral in winter, and in spring they were ceremoniously transferred to the cold Transfiguration Cathedral, where they rested in a silver reliquary. The relics were covered with a veil, except for the hand, which the faithful kissed. In 1919, the relics were opened and put on public display, despite protests from the faithful. Fearing further veneration, the authorities sent the relics to Vologda for exhibition in an anti-religious museum. From the 1920s until 1988, they were kept in the storerooms of the Vologda Museum-Reserve. In 1988, in honor of the 1000th anniversary of the Baptism of Rus, the relics were transferred to the Lazarus Gorbachyov Church in Vologda. On September 12, 1994, they were ceremoniously transferred to the Trinity Church in Totma, where they were placed in a reliquary. Since 2001, the relics have been in the Nativity Church of Totma.