Jomblang Reservoir is another remaining old clean water reservoir in Semarang that built during Dutch Colonial Era. Jomblang reservoir looks slightly bigger than The Siranda Reservoir. As similar as Siranda Reservoir, the building consist of two big domes.The appearance of the reservoir building is always visible as a silhouette of big dome with a cupola tower on Tanah Putih Hill.
The reservoir building is situated about 300 meter from 'Pasar Kambing Mrican' the goats market. The Jomblang Reservoir is part of Tanah Putih uphill road scenery. Always concealed under the lush big trees around Tanah Putih Hill.
Actually, the building appearance of Jomblang Reservoir is similar as the first older reservoir building belong to Siranda Reservoir. It also found at the Jomblang Reservoir same grass covered big domes, same small copula tower on the of the dome and also same entry facade. Anyway, the existence of these two old clean water reservoir buildings becomes one of the evidence that originally Semarang City is already well planned since almost hundred years ago.