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
Potaro River village located in forested terrain along the Potaro River south of Kaieteur Falls. Menzies Landing, a small settlement that is a 20-minute walk upriver from Kaieteur Falls, is the main staging area for up river travel. Up river from the falls, the Potaro Plateau stretches out to the distant escarpment of the Pakaraima Mountains. Placer gold and diamonds are extracted from the river in this mineral-rich area. Individuals who pan for gold are referred to as Porkknockers. In the first half of the 20th century miners, employing primitive methods, recovered significant quantities of gem-quality diamonds from the area's rivers and