"the Tropic of Cancer"

Map with Tropic of Cancer in red
Creative Commons Attribution Share AlikeMap with Tropic of Cancer in red - Credit: WikiLaurent
The Tropic of Cancer, also known as the Northern Tropic, is one of the five major lines of latitude shown on maps of the Earth.  The others are the Tropic of Capricorn, the Equator and the Arctic and Antarctic Circles.

The Tropic of Cancer passes through a large number of countries - India, the setting for The Far Pavilions, is one of them.