Arachan

The Arachan are associated with the lowlands around Laguna Merín, where eastern Uruguay meets the southern Brazilian coastal plain. Early travellers recorded Indigenous peoples under that name along this coast. The lagoon receives rivers descending from the surrounding hills and is bordered by extensive wetlands. Indigenous inhabitants of the basin built earthen burial mounds known as cerritos, leaving a distinctive record of life in this watery landscape.

The later city of Treinta y Tres lies here.