Database: mondial_geo
Question: Which three countries does the Amazonas flow through? Give the full name of the countries.
SQL: SELECT DISTINCT T4.Name FROM city AS T1 INNER JOIN located AS T2 ON T1.Name = T2.City INNER JOIN river AS T3 ON T3.Name = T2.River INNER JOIN country AS T4 ON T4.Code = T2.Country WHERE T3.Name = 'Amazonas'