The Cebollatí River is a Uruguayan river that rises in Cuchilla Grande (Big Ridge), flows southwest to northeast and forms a border between Treinta y Tres and Rocha.

At roughly 235 kilometres (146 mi), it is one of the longest rivers in Uruguay.

It forms in Cuchilla Grande, then joins the Rio Olimar Grande and flows into the Merin Lagoon in Treinta y Tres.

In October 2009 the National Hydrographic Institute of Uruguay started operating a free raft service across the Cebollatí River; this service allows commuters to cross from Treinta y Tres to Rocha in a wooden raft between the localities of Cebollatí and Charqueada.

• List of rivers of Uruguay
• Lagoon Mirim § Location
• Olimar Grande River

• Rand McNally, The New International Atlas, 1993.
• GEOnet Names Server Archived 2020-04-10 at the Wayback Machine

33°09′21″S 53°38′18″W / 33.15583°S 53.63833°W / -33.15583; -53.63833