Abstract. The article is devoted to the Moscow Society of Naturalists’ July 2025 expedition along the Volga River and the Lower Volga region. It describes in detail the expedition’s most significant events, including its route, workshops, lectures, exhibitions, and other activities.
Key words: Moscow Society of Naturalist, MSON, 220 years of MSON, Lomonosov Moscow State University, scientific societies of Russia, expedition, Fleet of floating universities, Volga river, Kamyshin