Arroyo Vivoratá is a tidal stream located near Laguna Mar Chiquita in the Buenos Aires province, flowing into that coastal lagoon. The waterway is notably shallow — shallow enough that paddlers in kayaks are visible moving through water that barely covers the bottom in places — and water levels fluctuate meaningfully with the tides. At low tide, sections of the banks and surrounding flats are exposed; at high tide, these same areas are submerged. Paddlers should plan their outings with tidal cycles in mind, as low water can make navigation difficult in shallower stretches.

Access to the arroyo involves leaving a vehicle near the road that enters from Mar Chiquita and walking approximately 200 meters along a worn path to reach the water. There is a gate along this route that has been observed standing open. The surrounding terrain is low and marshy, and rubber boots are useful for moving along the banks.

The character of the waterway is relaxed and oriented toward recreation rather than demanding paddling. The banks support populations of crabs and mullet (lisa), and pejerrey are also present. A large campsite with rental RVs is situated on the opposite bank, indicating that the area sees regular visitor activity. The stream connects to the broader Laguna Mar Chiquita system, which offers additional water for those wishing to extend a paddle beyond the arroyo itself.

Wildlife along the margins includes abundant crabs and various fish species. The overall environment is a low-lying coastal wetland typical of the Buenos Aires littoral zone, with tidal flats and grassy banks.