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
Kaieteur Falls point, Brown did not have time to investigate Kaieteur Falls closer, so he returned one year later to make comprehensive measurements. Brown’s book "Canoe and Camp life in British Guiana" was published in 1876. Two years later, in 1878, he published "Fifteen Thousand Miles on the Amazon and its tributaries". According to a Patamona Indian legend, Kaieteur Falls was named for Kai, a chief, or Toshao who acted to save his people by paddling over the falls in an act of self-sacrifice to Makonaima, the great spirit. Another legend though was told to Brown by Amerindians in the night of