Question: Tiong Bahru Plaza is located in the city that is at the southern tip of what landform?

Context paragraphs:
Koo Tsai Kee: Koo Tsai Kee () is a Singaporean associate professor and former politician.  He was a Member of Parliament from 1991 to 2011, representing the Tiong Bahru division under the Tanjong Pagar Group Representation Constituency (Tanjong Pagar GRC).  While he retired, his constituency was merged into Tanjong Pagar and renamed to Tanjong Pagar-Tiong Bahru.

Tiong Bahru: Tiong Bahru is a housing estate located within Bukit Merah Planning Area, in the Central Region of Singapore.  Built in the 1920s, Tiong Bahru is the oldest housing estate of the city-state.  It was the first project undertaken by the Singapore Improvement Trust (SIT), a government body administered by the British colonial authority, to provide for mass public housing in Singapore.  The main estate consists of about 30 apartment blocks with a total of over 900 units and also high-rise HDB flats and condominiums along Boon Tiong Road, Jalan Membina and Kim Tian Road surrounding the main estate.  The apartment blocks in the main estate are made up of two to five-storey flats and the units are assorted three to five-room apartments.

Tiong Bahru MRT Station: Tiong Bahru MRT Station (EW17) is an underground station located on the East West Line of the Mass Rapid Transit in Bukit Merah, Singapore.  It is the last underground MRT station on the line westwards.  The station is directly connected to a shopping mall, Tiong Bahru Plaza and is at Tiong Bahru Road and Jalan Membina.  The MRT Station serves the surrounding residential neighborhoods of Bukit Ho Swee, Bukit Merah View and Tiong Bahru.  The station's upgrading, which included a new lift for the disabled, was completed in 2006.

Tiong Bahru Plaza: Tiong Bahru Plaza (Simplified Chinese: 中峇鲁广场) is a shopping mall located in the northern part of the Tiong Bahru Estate in Bukit Merah, Singapore, near Tiong Bahru Road, Jalan Membina and Bukit Ho Swee Crescent.  It consists of a 20-storey office tower block (Central Plaza), and a 6-storey shopping and entertainment complex, with 3 basement carparks.

Tiong Bahru Group Representation Constituency: Tiong Bahru GRC is a group representation constituency that from 1988 to 1991, comprised Henderson, Radin Mas, and Tiong Bahru, in Singapore.  Once it is dissolved, it was quickly replaced by Tanjong Pagar GRC. Tiong Bahru GRC was led by Ch'ng Jit Koon and Co-led by S.Vasoo.

Henderson Single Member Constituency: Henderson Single Member Constituency was a constituency in Singapore.  It used to exist from 1972 to 1988, and it was merged into Tiong Bahru GRC.  It carved out of Tiong Bahru.

Singapore: Singapore ( ), officially the Republic of Singapore, sometimes referred to as the "Lion City", the "Garden City" or the "Little Red Dot", is a sovereign city-state in Southeast Asia.  It lies one degree (137 km) north of the equator, at the southern tip of the Malay Peninsula, with Indonesia's Riau Islands to the south.  Singapore's territory consists of one main island along with 62 other islets.  Since independence, extensive land reclamation has increased its total size by 23% (130 km) and its greening policy has covered the densely populated island with tropical flora, parks and gardens.

Tiong Bahru Secondary School: Tiong Bahru Secondary School (立道中学), established in 1966, was one of the pioneer bilingual integrated (混合中学) secondary schools built after Singapore Independence (August 9, 1965).  It had both Chinese and English streams, attracting students from nearby primary schools in Tiong Bahru, Bukit Ho Swee and Delta Road areas.  The first principal was Mr. Ngui Jim Chiang (1966-1970), a former World War II Lieutenant, who was succeeded by a former Raffles Institution Head of Department (Chemistry), Mr. Chan (1971 - ?) .

Tiong Bahru Single Member Constituency: Tiong Bahru SMC is a single member constituency between 1955 and 1991 in Tiong Bahru.

Tanjong Pagar Group Representation Constituency: Tanjong Pagar Group Representation Constituency (; Malay: "Kawasan Undi Perwakilan Berkumpulan Tanjong Pagar" ; Tamil: தஞ்சோங் பகார் குழுத்தொகுதி ) is currently a five-member Group Representation Constituency (GRC) in Central and Western Singapore, consisting of the Buona Vista, Queenstown, Moulmein-Cairnhill, Tanjong Pagar-Tiong Bahru and Henderson-Dawson electoral wards.  Geographically, this GRC consists of the areas of Tanjong Pagar, Queenstown, Tiong Bahru, Tanglin, Orchard Road, Bukit Merah, Buona Vista and Pek Kio.  It is co-led by Senior Minister of State for Finance and Law Indranee Rajah, and led by Minister in the Prime Minister's Office and Labour Chief Chan Chun Sing.  This GRC notably contains the electoral division where the late founding Prime Minister and former Senior Minister and Minister Mentor Lee Kuan Yew had stood since his debut in 1955.

Supporting paragraphs: Tiong Bahru Plaza Singapore
Answer: Malay Peninsula