An Eco Compact City (ECC) is a city built and developed in balance with the natural environment. It is a city with clear boundaries, with an optimun ratio between density and network of open public spaces defined by urban mixed-use blocks. It is a city made of a federation of organic urban neighborhoods and districts, but it can also be a metropolis. The optimum density that caracterizes the Eco Compact City allows the existence of a rich system of small retail, while allowing the creation of an efficient public transit system. The ECC allows its inhabitants to live within a pedestrian-friendly environment that encourages pedestrian movements, the use of the public transit, and discourages the intensive us of automobiles. The main goal of an ECC is to create a rich-interactive urban environment that optimize the use of natural resources and dramatically reduces the pollution of both the air and the natural landscape.