The spring was built using sandstone blocks joined with mortar made from lime, sand, and animal fats.
The hydraulic system was designed to ensure a constant water supply even during periods of drought.
It is one of the few surviving examples of domestic Jesuit-Guarani infrastructure outside of the main church ruins.
The water basin was strategically located to serve the residential area of the mission settlement.
Fonte Missioneira is an original water supply site constructed by the Guarani people and Jesuit missionaries during the 17th and 18th centuries in São Miguel das Missões. It features a unique hydraulic engineering system utilizing underground stone conduits to channel spring water into a masonry basin. The structure remains largely intact, showcasing the technical capabilities of the reduction-era inhabitants. It served as a vital water source for the daily needs of the nearby Jesuit Reductions. The site is characterized by its stone-lined channel and proximity to the main archeological ruins of the UNESCO World Heritage site. Visitors can observe the continuous flow of water that has persisted for centuries due to the efficient design of the original cistern system.
From the wooden walkway facing the stone basin, which allows for a clear view of the water channel's architecture.
Bring insect repellent as the lush, humid surroundings are a habitat for mosquitoes.
Wear comfortable, slip-resistant walking shoes as the area around the stone basin can be damp and uneven.
Combine this visit with the main São Miguel Arcanjo ruins to understand the full scope of the settlement.
Do not attempt to drink the water, as its safety is not monitored for human consumption.
Maintain silence, do not touch or climb on the historic masonry, and refrain from throwing objects into the water basin.
