Question: Of all the lakes in Bolivia, which is the deepest?
SQL: SELECT T1.Name FROM lake AS T1 INNER JOIN geo_lake AS T2 ON T1.Name = T2.Lake INNER JOIN province AS T3 ON T3.Name = T2.Province INNER JOIN country AS T4 ON T4.Code = T3.Country WHERE T4.Name = 'Bolivia' ORDER BY T1.Depth DESC LIMIT 1