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The River Cam is a tributary of the River Great Ouse in the east of England. The two rivers join to the south of Ely at Pope's Corner. The Great Ouse connects the Cam to England's canal system (via the Middle Level Navigations and the River Nene) and to the North Sea at King's Lynn. The total distance from Cambridge to the sea is about 40 mi (64 km).

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Queens' College is a constituent college of the University of Cambridge. Queens' is amongst the oldest and largest colleges of the university, founded in 1448 by Margaret of Anjou (the Queen of Henry VI, who founded King's College), and has some of the most recognisable buildings in Cambridge. The college spans both sides of the river Cam, colloquially referred to as the "light side" and the "dark side", with the world famous Mathematical Bridge connecting the two.
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The Mathematical Bridge is the popular name of a wooden footbridge that crosses the River Cam; about one hundred feet northwest of Silver Street Bridge and connects two parts of Queens' College. Its official name is simply the Wooden Bridge.
The bridge was designed by William Etheridge, and built by James Essex in 1749. It has been rebuilt on two occasions, in 1866 and in 1905, but has kept the same overall design. Although it appears to be an arch, it is composed entirely of straight timbers built to an unusually sophisticated engineering design, hence the name.
The original "mathematical bridge" was another bridge of the same design, also commissioned by James Essex, crossing the Cam between Trinity and Trinity Hall colleges, where Garret Hostel Bridge now stands.
The Bridge is Grade II listed. Link