The length of the pipeline is . The diameter of the pipe is , and its working pressure is , which is secured by six compressor stations. The Gryazovets-Vyborg pipeline, parallel to the branch of the Northern Lights pipeline (Gryazovets–Leningrad and Leningrad–Vyborg–Russian-state-border pipelines), also supplies gas to the Northwestern region of Russia, which includes Saint Petersburg and Leningrad Oblast. The pipeline is operated by Gazprom Transgaz Saint Petersburg. Baltic Sea offshore pipeline The Nord Stream offshore pipeline is operated by Nord Stream AG. It runs from the Vyborg compressor station at Portovaya Bay along the bottom of the Baltic Sea to Greifswald, Germany. The length of the subsea pipeline is , of which are on Russian inland, in Russian territorial waters, in the Russian economic zone, in the Finnish economic zone, in the Swedish economic zone, in Danish territorial waters, in the Danish economic zone, in the German economic zone, in German territorial waters, and on German inland. The pipeline has two parallel lines, both with a capacity of of natural gas per year. Pipes have a diameter of about , and wall thicknesses of with corresponding working pressures of . Middle and Western European pipelines Nord Stream is connected to two transmission pipelines in Germany. The southern pipeline (OPAL pipeline) runs from Greifswald to Olbernhau near the Germany–Czech Republic border. It connects Nord Stream with JAGAL (connected to the Yamal-Europe pipeline) and STEGAL (connected to the Russian gas transport route via Czechia and Slovakia) transmission pipelines. The Gazelle pipeline, put into operation in January 2013, links the OPAL pipeline with the gas network in southern Germany. The western pipeline (NEL pipeline) runs from Greifswald to Achim, where it is connected with the Rehden–Hamburg gas pipeline. Together with the MIDAL pipeline, it creates the Greifswald–Bunde connection. Further gas delivery to the United Kingdom is made through the connection between Bunde and Den Helder, and from there through the offshore interconnector Balgzand–Bacton (BBL Pipeline). Supply sources Russia's West Siberian petroleum basin is the source location for Nord Stream. The Yuzhno-Russkoye field, which is located in the Krasnoselkupsky District, Yamalo-Nenets Autonomous Okrug, Tyumen Oblast, was designated as the main source of natural gas for the Nord Stream 1 pipeline. Nord Stream 1 and 2 are also fed from fields in the Yamal Peninsula, namely Ob and Taz bays. It was predicted that the majority of the gas from Russia's offshore Shtokman field