Itá Pucú, Natural stone monument in Mercedes, Corrientes, Argentina.

Itá Pucú is a natural monument made of stone, located about 9 kilometres south-east of the centre of Mercedes, Corrientes, on the upper course of the stream of the same name, in a field that belonged to the Buble family and ceased to be private in 2018. Its Guarani name means 'long stone'. The stone forms part of the city's coat of arms.

In the past the stone served as a cavalry remount post, and travellers carved their names on it. José María Paz passed in 1841 while forming the Liberating Army of Corrientes, and Giuseppe Garibaldi came after his defeat at Costa Brava, taking refuge in Mercedes. Bartolomé Mitre stopped here returning from the Paraguayan fields to resume the presidency, and General Osorio camped at the site around 1865 on his march west of Mercedes.

Itá Pucú means "long stone" in Guarani, from itá (stone) and pucú (long). Local belief holds that the stone grows: people who visited years earlier say they find it noticeably taller on returning. The stone also forms part of the coat of arms of Mercedes.

The stone lies about 9 km southeast of Mercedes city centre, on the upper course of the Itá Pucú stream, in open countryside reached by rural roads. Since 2018 the field is no longer private, so access is open; there is no park, gate or set opening hours. Go in dry weather, as the track and stream banks turn muddy after rain.

The formation appears on the official shield of Mercedes city, confirming its importance as a geographical and cultural symbol of the region. This distinction sets it apart from many other natural monuments in the area.