I forgot this animé title! :(

I haven't watched this in YEARS so forgive me if some of the info I provide is super inaccurate, lol. I know the basic jist of this animé was that there was this girl and she appeared near this lake, and I think she was nude. There were some people peeking at her and I think she met this little boy and they went on some 'journey' with each other in the desert... atleast I think. I remember a flying rug in there too. Haha, hopefully I'm not confused so far!

Please tell me what toi think the animé may be, because It's been stuck in my head for a while now ):
Thanks~