De acordo com o IMDB :
Ela entra na atmosfera na costa leste do Mar Cáspio, então ela deve pousar na Ásia Central em algum lugar, mas podemos ouvir uma estação de rádio americana através do orador da Shenzhou, o que indicaria que ela está na América de alguma forma, então nós realmente Não sei onde ela pousa ... Que aparentemente era o ponto.The final scene was filmed at Lake Powell, Arizona, which is a giant water reservoir on the Colorado river. Whether this water was meant to represent Lake Powell in the movie itself as well is unknown; however, judging by the path of the debris it's doubtful, since the Tiangong is seen entering the atmosphere above the eastern shore of the Caspian Sea, so it would seem that Ryan Stone would have landed on a lake in Central Asia.
Yet, since we clearly hear an American radio station through the speaker of the Shenzhou it's probable that Alfonso Cuarón wanted to leave the exact place of the landing ambiguous.
In one of the bonus featurettes on the blu-ray DVD, the filmmakers address the landscape seen when Stone resurfaces. The surrounding terrain on Lake Powell is normally desert-like, with barren and rocky formations. They show how they took the surrounding landscape of Lake Powell and enhanced it to make it look like a green, living area.