Guyana the dryer savannah areas in the south-west; and the smallest interior lowlands (interior savannah) consisting mostly of mountains that gradually rise to the Brazilian border. Some of Guyana's highest mountains are Mount Ayanganna (), Monte Caburaí () and Mount Roraima ( – the highest mountain in Guyana) on the Brazil-Guyana-Venezuela tripoint border, part of the Pakaraima range. Mount Roraima and Guyana's table-top mountains (tepuis) are said to have been the inspiration for Sir Arthur Conan Doyle's 1912 novel "The Lost World". There are also many volcanic escarpments and waterfalls, including Kaieteur Falls which is believed to be the largest water
Adventures in Rainbow Country Actors who made appearances on the show included Gordon Pinsent, Margot Kidder, Len Birman, Percy Rodrigues, Duke Redbird, Jean-Louis Roux, Murray Westgate, Anthony Kramreither and Eric Christmas. The Sudbury and Manitoulin Districts are to this day known as the "Rainbow Country" tourist region, as a result of this series. A cast, crew and fan reunion event took place in Whitefish Falls from 11 to 14 August 2006. Adventures in Rainbow Country Adventures in Rainbow Country was a Canadian television series, which aired on CBC Television in 1970 and 1971. Reruns were later shown on the American children's cable channel Nickelodeon