Oman is a nation on the Arabian Peninsula with terrain spanning deserts, riverbed oases and long coastlines on the Persian Gulf, the Arabian Sea and the Gulf of Oman. The Wahiba Sands is a dune-filled region inhabited by Bedouins. The port capital Muscat is home to the vast, contemporary Sultan Qaboos Grand Mosque and the old seaside district of Muttrah, with a labyrinthine souk and bustling fish market.