The Brazilian exit checkpoint may not be immediately visible; look for it by taking the stairs to the left of the road, near shipping containers. The Paraguayan entry is generally unmonitored. Upon re-entering Brazil, you will encounter a checkpoint. While citizens of Brazil, Paraguay, and Argentina have specific entry allowances, other nationalities may be questioned about immigration stamps. Informally, passing through without an explicit stamp might be overlooked if no questions are asked, but it carries a degree of risk.
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