Most of the island is accessible from Budapest by the suburban railway.
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.
It features Hungary's tallest structure, Lakihegy Tower, a 314-metre (1,030 ft) radio mast used today intermittently for power network control purposes.