Guyana totals 214970 sq km, which is slightly smaller then Idaho. It shares borders with Brazil, Suriname and Venezuela.
It has a climate which is tropical; hot, humid, moderated by northeast trade winds, with two rainy seasons (May to mid-August, mid-November to mid-January).
Information source: http://www.cia.gov/cia/publications/factbook/geos/gy.html