Geneva is located at 46°12 North, 6°09' East, at the south-western end of Lake Geneva, where the lake meets the Rhone River. It is surrounded by two mountain chains, the Alps and the Jura.
The city of Geneva has an area of 15.86 km², while the area of the Canton of Geneva is 282 km², including the two small enclaves of Celigny in Vaud.
The part of the lake that is attached to Geneva has an area of 38 km² and is sometimes referred to as Petit lac (small lake).
The Canton has only a 4.5 km border with the rest of Switzerland; out of a total of 107.5 km of borders, the remaining 103 are shared with France, with the Department de l'Ain to the North and the Department of the Haute-Savoie to the South.