Kerala's taluks are further sub-divided into 1,674 revenue villages.[53][54] Since the 73rd and 74th amendments to the Constitution of India, the local government institutions function as the third tier of government, which constitutes 14 District Panchayats, 152 Block Panchayats, 941 Grama Panchayats, 87 Municipalities, six Municipal Corporations and one Township.[55] Mahé, a part of the Indian union territory of Puducherry,[56] though 647 kilometres (402 mi) away from it,[57] is a coastal exclave surrounded by Kerala on all of its landward approaches. The Kannur District surrounds Mahé on three sides with the Kozhikode District on the fourth.[58]