Answer:
Unfortunately, I cannot write you an entire essay. But I can give you a prompt and ideas.
Describe a jungle, but do not directly say you are in a jungle. This will satisfy the "trying to work out where you are" part.
Paragraph one: describe waking up, feeling the roughness of dirt and leaves under you.
Paragraph two: You realize you are in an unfamiliar place. Describe the confusion and fear.
Paragraph three: describe looking around. What do you see? Probably a lot of trees and undergrowth (ferns, vines, other plants). What do you hear? Probably the calls of birds, unlike the ones in the city. Try to be specific when describing plants ("vines stretched into the canopy above my head.") or sounds ("a twig cracked in a nearby thicket. I jumped, heartrate rising.")
Paragraph four: Describe the new fear that comes with realizing you are in a jungle. Describe what you know about the dangers of jungles: the predatory animals, the diseases you can catch. This would probably lead to a feeling of dispair, loss of hope. You can end your essay very strongly if you craft these negative emotions right, and conclude that you are lost, alone, and probably will not survive.