Csepel Island (Hungarian: Csepel-sziget) // is the largest island on the Danube River in Hungary. It is 48 km long; its width after 3–km sections of bifurcation and rejoining (confluence) is 6–8 km. Its area comprises 257 km² and its population is 165,000.
The isle extends south from Budapest; its northern point or section is Csepel – Budapest's District XXI. Most of the island is accessible from Budapest by the suburban railway. Notable towns include Ráckeve, Szigetszentmiklós, Szigethalom and Tököl. Csepel island was the first centre of the Hungarian conquest of the Carpathian Basin (Hungarian: honfoglalás: "conquest of the homeland"), being the early homestead of Árpád's tribe. The island is named after Árpád's horse groom, Csepel.
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