Question: What river is the city that Davor Bernardić was a leader of the SDP branch near?
Context: The Rupel Gorge or Rupel Pass (Greek: Στενωπό του Ρούπελ ; Bulgarian: Рупелски пролом ) is a steep river valley in the northern part of Central Macedonia, immediately south of the Greek-Bulgarian border.  It was formed by the Strymon River, which stems from the Vitosha mountains and flows into the Aegean Sea.  The gorge is rich in biodiversity which may be endangered by the project to build the Motorway 25 which is a part of European route E79.  Strymon enters from Bulgaria into Greece west of village Promachonas, going through Roupel Pass, that it opened up, between the mountains Belasica and Orvilos.  Here the ground gets flatter so the Strymon loses speed and splits into two branches.  The western branch goes to lake Kerkini and then flows southeast where it rejoins the eastern branch near to the village of Lithotopi. The Rockaway Beach Branch was a rail line owned and operated by the Long Island Rail Road in Queens, New York City, United States.  The line left the Main Line at Whitepot Junction in Rego Park heading south via Ozone Park and across Jamaica Bay to Hammels in the Rockaways, turning west there to a terminal at Rockaway Park.  Along the way it connected with the Montauk Branch near Glendale, the Atlantic Branch near Woodhaven, and the Far Rockaway Branch at Hammels. Zoran Milanović (] ; born 30 October 1966) is a Croatian politician who served as the Prime Minister of Croatia from December 2011 to January 2016.  He was the chairman of the Social Democratic Party of Croatia (SDP), the largest centre-left political party in Croatia, from 2007 until November 2016.  As such, apart from serving as Prime Minister, he was also the Leader of the Opposition on two separate occasions, from 2007 to 2011 and from January to November 2016, when Davor Bernardić succeeded him as SDP chairman. Dry Brook is a tributary of the Paulins Kill in Frankford Township and Branchville Borough in Sussex County in northwestern New Jersey, United States.  Its waters combine with the Culver Brook or West Branch of the Paulins Kill with the river's East Branch near the unincorporated hamlet Augusta near Branchville. The Whitestone Branch was a branch of the Long Island Rail Road, running north and east along the left bank of the Flushing River from the Port Washington Branch near the modern Willets Point/Flushing sections of Queens, New York.  It crossed the river on one of the three bridges that were later torn down for the Van Wyck Expressway, then ran north along Flushing Bay and east along the East River to Whitestone. Kosasthalaiyar River, also known as "'Kortalaiyar" in Manali a distributary, is one of the three rivers that flow in the Chennai metropolitan area.  The 136 km river originates near pallipet in thiruvallur District and drains into the Bay of Bengal.  Its northern tributary Nagari river originates in Chitoor district of Andhra Pradesh and joins the main river in the back waters of Poondy dam.  Its catchment area spreads in Vellore, Chitoor, North Arcot, Thiruvallur and Chennai districts.  It has catchment area in North Arcot District with a branch near Kesavaram Anicut and flows to the city as Cooum River and the main Kosasthalaiyar River flows to Poondi reservoir.  From Poondi reservoir, the river flows through Thiruvallur District, enters the Chennai metropolitan area, and joins the sea at Ennore creek.  There are two check dams across the river at Tamaraipakkam and Vallur.  The excess discharge in the river is controlled by the Tamarapakkam Anicut located across the river in the downstream of Poondi reservoir.  Vallur Anicut is a small check dam constructed near Minjur across the river to control water levels and feed irrigation channels in the area.  It flows to a distance of 16 km in the Chennai metropolitan area.  The total catchment area of the river is 3757 km , and the bed width ranges from 150 to .  The discharge capacity of the river is 110000 m3/s , and the anticipated flood discharge capacity is about 125000 m3/s . Zagreb (] ) is the capital and the largest city of Croatia.  It is located in the northwest of the country, along the Sava river, at the southern slopes of the Medvednica mountain.  Zagreb lies at an elevation of approximately 122 m above sea level.  In the last official census of 2011 the population of the City of Zagreb was 792,875.  The wider Zagreb metropolitan area includes the City of Zagreb and the separate Zagreb County bringing the total metropolitan area population up to 1,237,887.  It is the biggest metropolitan area in Croatia, and the only one with a population of over one million. Davor Bernardić (born 5 January 1980) is a Croatian physicist and politician who has been the president of the Social Democratic Party of Croatia (SDP) and Leader of the Opposition since 26 November 2016.  He had previously served as the one of four SDP Vice-presidents, leader of the SDP's Zagreb branch and president of the SDP Youth Forum.  Bernardić has been elected to the Croatian Parliament four times, representing the 1st electoral district. The Wanganui Branch is a 5.00 km branch line railway in the Manawatu-Wanganui region of New Zealand's North Island.  It links Wanganui with the Marton - New Plymouth Line (MNPL) at Aramoho and has been open since 21 January 1878, although solely for freight traffic since 7 September 1959.  Another branch line diverged from the Wanganui Branch near its terminus, the Castlecliff Branch. Springfield Gardens was an island platform station that existed along the Babylon-Montauk Branch of the Long Island Rail Road, in the Springfield Gardens, Queens section of Queens, New York City.  The station was located between St. Albans and Rosedale Stations, north of Springfield Junction.  The only visible evidence of the station today is by a wide gap between the tracks.  It first opened around the 1870s by the New York and Rockaway Railroad as Springfield Station (a name also given to a former station on the Atlantic Branch near Higbie Avenue).  It was originally located on Merrick Boulevard until May 1885 when it was moved to the southeast side of Springfield Road (now Springfield Boulevard).  The line was electrified on May 21, 1925 and the station was renamed Springfield Gardens in October 1927.  On July 24, 1936, the station was rebuilt as part of a grade elimination project, and finally closed on October 30, 1979.
Answer: Sava