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
Sioux Falls, South Dakota regional health care center. There are four major hospitals in Sioux Falls: Sanford Health (formerly Sioux Valley), Avera McKennan Hospital, the South Dakota Veterans Affairs Hospital, and the Avera Heart Hospital of South Dakota. Sanford Health and Avera Health are the largest and second largest employers in the city, respectively. Emergency medical services (EMS) are provided by Paramedics Plus and Sioux Falls Fire Rescue. Companies based in Sioux Falls include Raven Industries, retailers Lewis Drug and Sunshine Foods, as well as communications companies SONIFI Solutions and Midcontinent Communications. Because of the relatively long distances between Sioux Falls and larger cities,