text:  The city has been completely mapped and covered an area greater than 16 square kilometres ( 6 @.@ 2 sq mi ) that included about 3 @,@ 000 structures . The topography of the site consists of a series of parallel limestone ridges rising above swampy lowlands . The major architecture of the site is clustered upon areas of higher ground and linked by raised causeways spanning the swamps . The area around Tikal has been declared as the Tikal National Park and the preserved area covers 570 square kilometres ( 220 sq mi ) . 
  