Siladzirnavu lake, Jaungulbene mill lake, Liedes lake is located in Jaululbene parish of Gulbene district. The lake is installed in the Liede River (its level is raised by 3 m). The level of the lake is 122.5 m above sea level. Area 48.4 ha, length 1.4 km, maximum width 0.7 km, maximum depth 3.2 m. The pool area is 30 square kilometers.
The reservoir in the lowland forest is very bayy. Liede flows through the south-eastern part of the lake, but the wider, shallow NW area is overgrown and receives a tributary. Overgrowth 60%.
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