Prut Toltres (Toltrele Prutului), also known as Prut Rocks (Stâncile Prutului), are a chain of limestone reef formations, over a distance of about 200 km along the middle of Prut river in Moldova. It starts from Criva, near the northern border area of the country and continues to Cobani, 200 km further south. They are natural monuments and protected by law. These chains are made of limestone reefs of corals, mollusks, clams, algae and other marine organisms that filled the Tortonian and Sarmatic tropical seas 10 - 20 millions years ago.

Prut rocks are concentrated on a small area in the small basins of rivers Larga, Vilia, Lopatnicul, Draghişte, Racovăţul, Ciuhurul and Camenca flowing into the Middle Prut. Although heavily fragmented in several places, chains reefs are present today as a unitary structure spanning a distance of almost 200 km. So if we want to locate the rocks, which are not directly in Prut River, but in the basin of its affluents, at a distance of a few kilometers from the left bank of the Prut.

15-20 million years ago, Moldova was covered by Sarmatian Sea. The waters of this sea were life soaking and were inhabited and traversed by million very diverse organisms, some similar to those that currently dominate the warm seas and other creatures that bore no resemblance to today. In the depths of the sea, fish swimming among seaweed, jellyfish and crustaceans, waves were furrowed dolphins and sharks following their easy prey, and in estuaries of rivers hippos grazing grasses halophile limans since. The sea withdrew long ago and today paleontologists can study that treasure stoned in time, today unveiled on coastal hills and valleys, especially along rivers, at the foot of secular woods.