Concept:The point where two rivers meet is called a confluence.
Explanation:R. Isbo and R. Gembeh are separate rivers.
Their waters join at a particular point on the map.
In geography, the junction where two rivers or streams merge is known as a confluence.
It is not an entrepot, which is a trading centre.
It is also not a watershed, which is an elevated drainage divide.
It is not a lagoon, which is a shallow body of coastal water.
Thus, the correct geographic term is confluence.
Answer:D. A confluence
