Troms or Romsa (Sami language) is a county in North Norway, bordering Finnmark to the northeast and Nordland in the southwest. To the south is Norrbotten Län in Sweden and further southeast is a shorter border with Lapland Province in Finland. To the west is the Norwegian Sea (Atlantic ocean). The entire county is located north of the Arctic circle. Until 1919 the county was formerly known as Tromsø amt. On 1 July 2006, the Northern Sami name for the county, Romsa, was granted official status along with Troms.
Troms is located in the northern part of the Scandinavian peninsula. Due to the long distance to the more densely populated areas of the continent, this is one of the least polluted areas of Europe. Troms has a very rugged and indented coastline facing the Norwegian Sea. However, the large and mountainous islands along the coast provide an excellent sheltered waterway on the inside. Starting in the south, the largest islands are: northeastern part of Hinnøya (the southern part is in Nordland), Grytøya, Senja, Kvaløya, Ringvassøya, Reinøy, Vannøy and Arnøy. Some of these islands, most noteworthy Senja, have a rugged outer coast with steep mountains, and a more calm eastern shore. There are several large fjords that stretch quite far inland. Starting in the south, the largest fjords are Vågsfjord, Andfjord (shared with Nordland), Malangen, Balsfjord, Ullsfjord, Lyngen (the municipality has its name from the fjord) and Kvænangen (fjord). The largest lake is Altevatnet in the interior of the county.
There are mountains in all parts of Troms; the most alpine and striking are probably the Lyngen Alps (Lyngsalpene), with several small glaciers and the highest mountain in the county, Jiekkevarre (1833 m). Several glaciers are located in Kvænangen, including parts of the Øksfjordjøkelen, the last glacier in mainland Norway to drop icebergs directly into the sea (in Jøkelfjord). The largest river in Troms (waterflow) is Målselva (in Målselv), and the largest (not the highest) waterfall is Målselvfossen (600 m long, 20 m high). There are limestone bedrock in parts of Troms, and thus numerous caves, as in Salangen and Skånland.