RIYADH, July 29 (Reuters) - A young Saudi prince died of thirst in the desert on Monday, the official media reported. Prince Fahd bin Turki bin Saud al-Kabeer, 25, was travelling through the kingdom's Rimah area, where temperatures in some areas can rise above 45 degrees celsius (113 F) in the summer. No other details were given. ((Gulf newsroom, +971 4 391 8301, fax +971 4 391 8335, dubai.newsroom@reuters.com)) © Reuters Limited.