The Sana (Serbian Cyrillic: Сана, pronounced [sǎːna]) is a river in the north-western part of Bosnia and Herzegovina. It is a tributary of the Una, which it flows into at Novi Grad. It is the longest of the nine rivers that flow through Sanski Most, and is 142 km long. It is not a navigable waterway.
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The Una-Sana Canton (Bosnian: Unsko-sanski kanton; Croatian: Unsko-sanska županija; Serbian: Унско-сански кантон, romanized: Unsko-sanski kanton) is a federated state and one of the ten cantons of the Federation of Bosnia and Herzegovina in Bosnia and Herzegovina. It is located in the northwest of the country, a region known as Bosanska Krajina, and has been named after the rivers Una and Sana. Its cantonal seat is the city of Bihać.
The canton is bordered by Republika Srpska from the east, the Canton 10 from the southeast, and Croatia from the south, west, and north. The majority of the population is Bosniak (90%).
The Una (Serbian Cyrillic: Уна, pronounced [ûna]) is a border river between Bosnia and Herzegovina and Croatia and a right tributary of the Sava river. It is part of the Black Sea drainage basin, and its watershed has a size of 10,200 km (3,900 sq mi), of which 8,080 km (3,120 sq mi) belongs to Bosnia and Herzegovina, and 2,120 km (820 sq mi) to Croatia. The total length of the river is 212 km (132 mi). The source of the river is located near the village of Donja Suvaja in Croatia, and its mouth is located near the village of Jasenovac, on the border with Bosnia. The largest right tributaries are the Krka, Unac, Krušnica and Sana rivers, and the largest left tributary is the Klokot river. Its longest headwater is the Unac river. The largest and most important city located on the river is Bihać. Other, important cities and towns are Bosanska Krupa, Bosanski Novi and Bosanska Kostajnica. The river is characterized by a multitude of waterfalls, rapids, karst springs and relatively untouched nature. A large part of the upper river is part of the Una National Park.