Sasthamangalam is a popular residential area in Thiruvananthapuram city. It is 1 km away from Vellayambalam. From Sasthamangalam junction, four roads lead to four different directions such as Vattiyoorkavu, Vellayambalam, Edapazhinji and Peroorkada via Pippinmoodu.

The major landmarks include Sree Ramakrishna Hospital, Tandem Group of Institutions, Raja Kesavadas NSS High School, Alakapuri Auditorium and Jet Airways office.