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Silsako
''Not to be confused with the small stone bridge Silsako, in North Guwahati.

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Silsako in 1851

]] Silsako was an ancient stone bridge over a channel of river Barnadi in Hajo, Kamrup. As the channel changed its course over time, now the bridge is stranded in the middle of a small lake. It was an important transit route in ancient and medieval times. Many invaders like Muhammed Bin Bukhtiyar entered into Kamarupa in the year 1205-06 AD, and crossed the bridge Silsako. This historical bridge sustained damage in the 1897 Assam earthquake.

Hannay, who in 1851 saw and measured the bridge, wrote as follows: