Monaco is the second-smallest country by area in the world; only Vatican City is smaller.  Monaco is the most densely populated country in the world. The state consists of only one municipality (''commune''), the Municipality of Monaco. There is no geographical distinction between the State and City of Monaco, although responsibilities of the government (state-level) and of the municipality (city-level) are different.  According to the constitution of 1911, the principality was subdivided into three municipalities: