Tbilisi (English: /təbɪˈliːsi, təˈbɪlɪsi/ tə-bih-LEE-see, tə-BIL-ih-see; Georgian: თბილისი [tʰbilisi] (About this soundlisten)), in some countries also still known by its pre-1936 international designation Tiflis (/ˈtɪflɪs/ TIF-lis), is the capital and the largest city of Georgia, lying on the banks of the Kura River with a population of approximately 1.5 million people. Founded in the 5th century AD by Vakhtang I of Iberia, since then Tbilisi served as the capital of various Georgian kingdoms and republics. Between 1801 and 1917, then part of the Russian Empire, Tbilisi was the seat of the Imperial Viceroy, governing both Southern and Northern Caucasus. Because of its location on the crossroads between Europe and Asia, and its proximity to the lucrative Silk Road, throughout history Tbilisi was a point of contention among various global powers. The city's location to this day ensures its position as an important transit route for various energy and trade projects. Tbilisi's diverse history is reflected in its architecture, which is a mix of medieval, neoclassical, Beaux Arts, Art Nouveau, Stalinist and the Modern structures. Historically, Tbilisi has been home to people of multiple cultural, ethnic, and religious backgrounds, though it is currently overwhelmingly Eastern Orthodox Christian. Its notable tourist destinations include cathedrals Sameba and Sioni, Freedom Square, Rustaveli Avenue and Agmashenebeli Avenue, medieval Narikala Fortress, the pseudo-Moorish Opera Theater, and the Georgian National Museum. Tbilisi is located in the South Caucasus at 41° 43' North Latitude and 44° 47' East Longitude. The city lies in Eastern Georgia on both banks of the Mt'k'vari River. The elevation of the city ranges from 380–770 metres above sea level (1,250–2,530 ft) and has the shape of an amphitheatre surrounded by mountains on three sides. To the north, Tbilisi is bounded by the Saguramo Range, to the east and south-east by the Iori Plain, to the south and west by various endings (sub-ranges) of the Trialeti Range. The relief of Tbilisi is complex. The part of the city which lies on the left bank of the Mt'k'vari River extends for more than 30 km (19 mi) from the Avchala District to River Lochini. The part of the city which lies on the right side of the Mt'k'vari River, on the other hand, is built along the foothills of the Trialeti Range, the slopes of which in many cases descend all the way to the edges of the river Mt'k'vari. The mountains, therefore, are a significant barrier to urban development on the right bank of the Mt'k'vari River. This type of a geographic environment creates pockets of very densely developed areas while other parts of the city are left undeveloped due to the complex topographic relief. To the north of the city, there is a large reservoir (commonly known as the Tbilisi Sea) fed by irrigation canals.