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In page Java:

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The area of Java is about 132,011.65 square kilometres (50,969.98 sq mi) (including Madura's 5,408.45 square kilometres (2,088.21 sq mi) and minor offshore islands).[5] It is about 1,000 km (620 mi) long and up to 210 km (130 mi) wide. The island's longest river is the 600 km long Solo River.[7] The river rises from its source in central Java at the Lawu volcano, then flows north and eastward to its mouth in the Java Sea near the city of Surabaya. Other major rivers are Brantas, Citarum, Cimanuk and Serayu.[citation needed]