noun, plural agencies. 1. an organization, company, or bureau that provides some service for another: a welfare agency. 2. a company having a franchise to represent another. 3. a governmental bureau, or an office that represents it.
Causeways and Canals. Early on in the history of the city the Aztecs built causeways and canals for transportation to and from the city. A causeway is a raised road that allowed the people to easily travel over the swampy and wet areas. There were three major causeways that led from the island city to the mainland.
The capital of the Aztec empire, Tenochtitlan, was, in its era, one of the largest cities in the world. Built on an island in the middle of a shallow lake, its population numbered perhaps 150,000, with another 350,000 people in the urban network clustered around the lake shores.