The O2 is a large entertainment district located on the Greenwich Peninsula in Southeast London, England. The O2 Arena, the indoor arena within the district, is situated in the center of The O2 complex. The complex is built largely within the former Millennium Dome and is near the North Greenwich tube station on the Jubilee line. The O2 is just east of central London, on a sharp bend of the River Thames, and is almost entirely surrounded by water. It is a prominent landmark and a major venue for music, sports, and entertainment events.