<Li> Guha - durga: Located in a valley surrounded by hills, where the outposts and the signal towers are located . </Li> <Li> Vana - durga (Forest fort): Surrounded by a dense forest over a distance of at least 4 kroshas (14.6 km). <Ul> <Li> Khanjana - durga, built on a fen surrounded by thorny forests . </Li> <Li> Sthambha - durga, built in the forest among tall trees; lacks sufficient water sources . </Li> </Ul> </Li> <Ul> <Li> Khanjana - durga, built on a fen surrounded by thorny forests . </Li> <Li> Sthambha - durga, built in the forest among tall trees; lacks sufficient water sources . </Li> </Ul> <Li> Khanjana - durga, built on a fen surrounded by thorny forests . </Li>

5 important forts established by british in india