Passage: The river is 1,143 km (710 mi) long and up to 700 m (2,300 ft) wide at its delta; with a total area of 98,740 km2 (38,120 sq mi), the river basin covers more than 67% of West Kalimantan. The discharge rate varies through the year, averaging around 6,000–7,000 m3/s (210,000–250,000 cu ft/s) at the delta and 2,000 m3/s (71,000 cu ft/s) upstream, at the confluence of the Tawang River. The discharge peaks during the rainy seasons in April and November, during which the water level may rise by 10–12 m (33–39 ft) overnight, overflowing river banks and flooding the nearby areas.The river originates near the center of Borneo, south from the Indonesian-Malaysian border, in the joint between the western slope of the Müller Mountain Range, which runs through the island center, and the southern slope of the Upper Kapuas Range (Indonesian: Kapuas Hulu), which is located more to the west. For about 165 km (103 mi) it flows through a mountainous terrain and then descends to a marshy plain. There, the elevation decreases by only 50 meters (160 ft) over 900 km (560 mi) from Putussibau to the river delta. About 350 km (220 mi) from the source, near the northern shore of the river, lies a system of Kapuas Lakes which are connected to the river by numerous channels. These lakes are Bekuan (area 1,268 hectares), Belida (600 ha), Genali (2,000 ha), Keleka Tangai (756 ha), Luar (5,208 ha), Pengembung (1,548 ha), Sambor (673 ha), Sekawi (672 ha), Sentarum (2,324 ha), Sependan (604 ha), Seriang (1,412) Sumbai (800 ha), Sumpa (664) and Tekenang (1,564 ha). When the monthly precipitation exceeds about 300 mm (12 in), the river overflows its banks, diverting much of its waters to the lakes at a rate of up to 1,000 m3/s (35,000 cu ft/s), and forming a single volume of water with them. This outflow prevents massive flooding of the lower reaches of the river; it also promotes fish migration from the river to the lakes for spawning, but drives  birds away from the lakes.The river discharges into the South China Sea creating a marshy delta,...

Question: In what direction from Pontianak is the delta located?
west-southwest