saudi arabia occupies about 80 percent of the arabian peninsula (the world's largest peninsula), lying between latitudes 16° and 33° n, and longitudes 34° and 56° e. because the country's southern borders with the united arab emirates and oman are not precisely marked, the exact size of the country is undefined. the cia world factbook estimates and lists saudi arabia as the world's 13th largest state. it is geographically the largest country in the arabian plate.