In this question, we are given four pairs and we need to find the pair that is not correctly matched.
Option 1 states that HeveaTree is found in Brazil. This is a correct match as HeveaTree is primarily found in the Amazon rainforest in Brazil.
Option 2 states that Sumatra is in Malaysia. This is an incorrect match. Sumatra is actually an island located in Indonesia.
Option 3 states that Kajan River is in Borneo. This is a correct match as the Kajan River is one of the major rivers in Borneo.
Option 4 states that Dekke Toba fish is found in Brazil. This is an incorrect match. Dekke Toba is actually a lake located in Sumatra, Indonesia.
Therefore, option 4 is the correct answer as it is not correctly matched.