Being crossed the Amazonian Colombia-Peru border, forgot to put a crossing stamp on the passport, the thing is, you can do it freely and as many times as you want around the Tabatinga, Leticia and Santa Rosa area (Tres Fronteras, Brasilia Colombia Peru) there’s no obvious border control out there, you can get all these borders crossed not at once only in case if you don’t wanna proceed further on into the particular country, to have a long trip in-depth, you gonna need to go Immigration and put the stamp, otherwise it would be considered as illegal border crossing.
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