vessel is named "RSS Kallang", as part of a series of vessels named after Singapore's coastal regions. Kallang is also drained by the Geylang River, Rochor River, Rochor Canal, Marina Channel, Sungei Whampoa and the Pelton Canal, the latter two of which are tributaries of the Kallang River. These aforementioned waterways, together with the Singapore River and Marina Bay, make up the Marina Reservoir that has a catchment size of about one-sixth of mainland Singapore's land area. Kallang constitutes part of the Drainage Catchments of Bukit Timah, Geylang, Stamford Marina and Kallang, as per the Public Utilities Board (PUB). Kallang Drainage Catchment only extends into a small part of the Kallang Planning Area; it also encompasses areas belonging to the planning areas of Toa Payoh, Serangoon, Bishan, Ang Mo Kio, Central Water Catchment and Bukit Panjang. Due to the high concentration of waterways in Kallang, many bridges were constructed to cross over these rivers and canals. Some famous bridges found in Kallang include the Merdeka Bridge, Benjamin Sheares Bridge (Singapore's tallest and longest bridge; reaches its highest point of 29 metres at Kallang Basin) and the Tanjong Rhu Footbridge (the first suspension bridge in Singapore). History Boundaries The present-day boundaries of Kallang Planning Area are established by the Urban Redevelopment Authority (URA) for urban planning purpose. Prior to the creation of "planning areas", Singapore was divided into two types of survey districts by the Singapore Land Authority (SLA): "mukim" in rural areas and "town subdivisions" in the city. There were two mukim that bore the name "Kallang": Kallang and Ulu Kallang. Kallang mukim The mukim of Kallang (alternatively spelled as "Kalang") was roughly bounded by Upper Serangoon Road, Serangoon Road and the Kallang River to its west; Upper Paya Lebar Road to its north and east; Paya Lebar Road to its east; and Geylang Road to its south. The areas that once belonged to the former Kallang mukim are now split among the planning areas of Serangoon, Toa Payoh, Geylang and Kallang. On the other hand, the areas that now form Kallang Planning Area were shared by the now-dissolved mukims of Toa Payoh, Geylang (formerly spelled as "Gelang"), Kallang and various town subdivisions. The modern boundaries of Kallang Planning Area therefore differ from those of the Kallang mukim. Ulu Kallang mukim A vast region at the upstream of the Kallang River was part of the mukim of Ulu Kallang (also