Romania has diverse terrain including the Carpathian and Transylvanian mountains, Western Hills and Plains, the Danube River and Delta, and the Black Sea coast. The climate varies regionally from cool and wet in the northern mountains to warmer along the Black Sea. Romania has a population of over 21 million, with major industries including agriculture, energy, and tourism focused on attractions like the Danube Delta, Transfăgărășan road, and painted monasteries.