More than 300 children were killed; the people were members of a group led by Jim Jones in Jonestown, the settlement which they had created.
Jim Jones's bodyguards had earlier attacked people taking off at a small remote airstrip close to Jonestown, killing five people, including Leo Ryan, a US congressman.
Some of Guyana's highest mountains are Mount Ayanganna (2,042 metres or 6,699 feet), Monte Caburaí (1,465 metres or 4,806 feet) and Mount Roraima (2,772 metres or 9,094 feet – the highest mountain in Guyana) on the Brazil-Guyana-Venezuela tripoint border, part of the Pakaraima range.
The legacy of British rule is reflected in the country's political administration and diverse population, which includes Indian, African, Amerindian, and multiracial groups.
Guyana is the only South American nation in which English is the official language.
The four longest rivers are the Essequibo at 1,010 kilometres (628 mi) long, the Courantyne River at 724 kilometres (450 mi), the Berbice at 595 kilometres (370 mi), and the Demerara at 346 kilometres (215 mi).
The Corentyne river forms the border with Suriname.
Guyana is bordered by the Atlantic Ocean to the north, Brazil to the south and southwest, Suriname to the east and Venezuela to the west.
With 215,000 square kilometres (83,000 sq mi), Guyana is the fourth-smallest country on mainland South America after Uruguay, Suriname and French Guiana (an overseas region of France).
The American government supported Forbes Burnham during the early years of independence because Cheddi Jagan was identified as a Marxist.
They provided secret financial support and political campaign advice to Burnham's People's National Congress, to the detriment of the Jagan-led People's Progressive Party, which was mostly supported by Guyanese of East Indian background.
In 1899 an international tribunal ruled the land belonged to Great Britain.
The British territorial claim stemmed from Dutch involvement and colonization of the area also dating to the sixteenth century, which was ceded to the British.
There are also many volcanic escarpments and waterfalls, including Kaieteur Falls which is believed to be the largest water drop in the world.