Answer:
It would be Indonesian Flag.
Step-by-step explanation:
Indonesia is regarded as the largest archipelago in the world, and the home of Borneo, one of the world's largest Oxygen provider due to the size of its forest.
The Indonesian flag has two colors, red on top and white bottom. If its turned upside down, it will become the flag of poland.
I will include some pictures for you to see. Indonesian flag on the left, poland flag on the right.