most tourist development has occurred. The northern and eastern coasts, lacking this protection, are considerably more battered by the sea and have been left largely untouched. As of 2022, Aruba only has 2.3% of forest-covered land area and only 0.5% of protected natural area. The hinterland of the island features some rolling hills, such as Hooiberg at and Mount Jamanota, the highest on the island at above sea level. Oranjestad, the capital, is located at . The Natural Bridge was a large, naturally formed limestone bridge on the island's north shore. It was a popular tourist destination until its collapse in 2005. Cities and towns The island, with a population of about 116,600 people (1 January 2019 estimate) does not have major cities. It is divided into six districts. Most of the island's population resides in or around the two major city-like districts of Oranjestad (the capital) and San Nicolaas. Oranjestad and San Nicolaas are both divided into two districts for census purposes only. The districts are as follows: Noord Oranjestad (East and West) Paradera San Nicolaas (North and South) Santa Cruz Savaneta Fauna The isolation of Aruba from the mainland of South America has fostered the evolution of multiple endemic animals. The island provides a habitat for the endemic Aruban Whiptail and Aruba Rattlesnake, as well as an endemic subspecies of Burrowing Owl and Brown-throated Parakeet. Flora The flora of Aruba differs from the typical tropical island vegetation. Xeric scrublands are common, with various forms of cacti, thorny shrubs, and evergreens. Aloe vera is also present, its economic importance earning it a place on the coat of arms of Aruba. Cacti like Melocactus and Opuntia are represented on Aruba by species like Opuntia stricta. Trees like Caesalpinia coriaria and Vachellia tortuosa are drought tolerant. Climate and natural hazards By the Köppen climate classification, Aruba has a hot semi-arid climate (Köppen BSh). Rainfall is scarce, only per year; in particular, rainy season is drier than it normally is in tropical climates; during the dry season, it almost never rains. Owing to the scarcity of rainfall, the landscape of Aruba is arid. Mean monthly temperature in Oranjestad varies little from to , moderated by constant trade winds from the Atlantic Ocean, which come from the north-east. Yearly rainfall barely exceeds in Oranjestad, although it is extremely variable and can range from as little as during strong El Niño years (e.g. 1911/1912,