In 1975–6, she travelled by boat through the tributaries of the Amazon River of Brazil and visited the high mountain ranges of Peru and Bolivia. Thirty six tribal groups were visited over a period of six months; the trip was called The Green Light Expedition,[22][23][24] which followed Khanum's The Great African Safari.[25] There have also been projects developed from the original expedition – In the Footsteps of the Green Light Expedition[26] and Tear of the Clouds.[27]