How Hyderabad and Secunderabad became twin cities
The British Cantonment, the Hussain Sagar, and a 19th-century separation that lingered.
Secunderabad began as a British military cantonment in 1806 and grew into a parallel city across the Hussain Sagar from old Hyderabad.
Established by treaty between the British East India Company and the third Nizam, Sikander Jah (after whom Secunderabad is named), the cantonment housed British and later Indian Army units throughout the colonial era and after.
The Hussain Sagar lake — the visible 'border' between the two cities — was built in 1562 but became the spatial mediator between the Nizam's old city and the Cantonment-era new city by the late 19th century. The Buddha statue in the middle of the lake is a much later addition (1992).
Municipal merger came late: GHMC (Greater Hyderabad Municipal Corporation) only consolidated the two in 2007, and many residents still treat them as distinct.