True Friends (1954) on Netflix

Plot summary

Three boys on the Yauza River outside Moscow, Aleksandr, Boris and Vasiliy, sail a raft and promise to travel a great river together one day. Thirty years pass. Boris Chizhov becomes a professor of neurosurgery, Aleksandr Lapin heads an experimental institute of animal husbandry, and Vasiliy Nestratov is an academician of architecture, an official difficult to contact. Lapin remembers the promise, gathers his friends, and the three set out on a wooden raft down the Volga. A run of mishaps follows them on the water. They meet the manager Vitaliy Nekhoda, and Aleksandr finds Natalya Sergeyevna Kalinina, a woman he loved long ago.