Ruse is located in the northeastern part of the country, opposite the Romanian city of Giurgiu. Ruse is located on the right bank of the Danube, which is the high bank, having two underwater terraces and three river terraces. The average altitude is 45.5 m. The urban area is an approximately 11-km ellipse running along the river. The city extends from the land-connected Matey island and the mouth of Rusenski Lom on the west to Srabcheto hill on the east. During the 20th century, the west end of the city was significantly modified by moving the mouth of Rusenski Lom to the west, as well as by moving the bank itself with its fairway considerably to the north. Sarabair hill is to the south of the city and is 159 m. high. The Ruse TV Tower is built there on the remains of Leventtabia, a former Turkish fortification. Ruse is a big industrial centre. It has a duty-free zone and 2 industrial zones: East and West. Ruse is located 320 km. northeast of Sofia city, 203 km. northwestern from Varna and 106 km. northeast of city Veliko Tarnovo. Ruse is the biggest Bulgarian port towns on the bank of the Danube River. After the opening of the Rhine–Main–Danube Canal which covers 3,500 km and connects 13 European countries with Asia via the Black Sea, the river becomes the longest inland waterway on the planet. Ruse is one of the 100 Tourist Sites of Bulgaria. The city is famous for its preserved buildings from the end of the 19th and the beginning of the 20th century. There are more than 260 monuments. Most of the sights of the city are located at the center of Ruse (museums, architectural landmarks, the theater, the opera, hotels, restaurants, cafes and souvenir shops).