 The temple on the hill in Cambodia on which Lara lands on is Phnom  Bakheng which is just outside the South Gate of the city of Angkor  Thom. Next, when we see her drive her jeep off, Lara is at Bayon, at  the center of Angkor Thom. The temple with trees overgrown on it,  where Lara falls into the hidden tomb, is probably Ta Prom.