The Split and Dalmatia County is the largest county in the Republic of Croatia. It covers 14,045 km², 4,572 km² of land (including the islands) and 9,473 km² of sea, which is about 8% of the area of Croatia. The county Capital is Split. The main natural features of the county are the sea and the karst. The karstified limestone mountains run parallel to the coast and are cut by rare saddles. The longest and economically most important river is the Cetina river which flows through a deep canyon in the central part of the county. The most important karst sights are the Imotski Lakes, Red Lake and Blue Lake and the Vranjača cave.