For today's Geo Quiz -- we're searching for an island where young orangutans can get a little frisky up in the trees.

We're searching for one of the last remaining orangutan habitats in the world. It's on the largest and the northernmost island in the Indonesian archipelago.

Orangutan

Orangutans are the largest tree dwelling mammal. They like lush tropical forests where they can stretch out their long arms...and swing from branch to branch...as they search for fruits and leaves to eat. Sometimes they just hang upside down for awhile.

So whichever way you choose to look at a map, upside down or right side up. Try to spot the island we're looking for. It's the 6th largest island in the world.

We'll pay a visit to a wildlife sanctuary there and hear more about the endangered orangutans here...