Greater Sochi has 4 administrative districts. Central Sochi District is the core of the city and its most developed and populated part. Many of the city attractions, hotels and most shopping centers are there. During the summer season, Central Sochi is usually overcrowded and traffic-jammed. Lazarevskoye District is the largest (1744 km2) and the longest (65 km coastline) one among Sochi districts, includes 34 sub-districts, most of them are spread along the sea shore. Lazarevskoe district is less urbanized that other ones in Greater Sochi. In fact it has many various settlements, often poorly connected with each other and lacking basic infrastructure. Khosta District is to the south-east from Central Sochi, this district contains some major attractions, such as Akhun mountain. While Adler District is the city's important transport hub, which includes Sochi International Airport, Adler train terminal (final point for most trains going to Greater Sochi) and the only open border crossing with Abkhazia. The role of Adler is rapidly increasing now because it will host all the Olympic venues for the 2014 Games (the Olympic coastal cluster at Imeretinskaya lowland and the mountain cluster at Krasnaya Polyana). By 2014 the look of Imeretinskaya lowland and Krasnaya Polyana has drastically changed, as well as the local transport infrastructure., Sochi (Russian: Сочи, IPA: [ˈsotɕɪ] ⓘ, from Ubykh: Шъуача – seaside) is the largest resort city in Russia. The city is situated on the Sochi River, along the Black Sea in the North Caucasus of Southern Russia, with a population of 466,078 residents, [12] and up to 600,000 residents in the urban area. The city covers an area of 176.77 square kilometers (68.25 sq mi), [5] while , Sochi is often called the unofficial 'Summer Capital' of Russia, or the Black Sea Pearl. This is the country's biggest and busiest summer sea resort, attracting more than 4 million visitors annually with its amazing mountainous coastline, endless shingle beaches, warm sunny days, and bustling nightlife. From May to September Sochi's population at least doubles with tourists, including .