Saudi Arabia is located in the Middle East, bordered by 7 countries, and occupies most of the Arabian Peninsula. It has varied terrain including mountain ranges along the western edge, higher elevations in the south, and a central arid plateau where 28% of Saudis live. 95% of the country is desert, including the world's largest sandy desert Rub al Khali. The largest oasis is Al-Ahsa, located inland from the Persian Gulf, with over 3 million palm trees. The country has a generally harsh desert climate with high summer temperatures and low rainfall. Major resources include petroleum, natural gas, gold, silver and copper.