Definition of a boundary: A boundary is a real or imaginary line that separates two things. In geography, boundaries separate different regions of the Earth. There are many different types of boundaries.
3 types of boundaries:
Physical Boundary- is a naturally occurring barrier between two areas. Rivers, mountain ranges, oceans, and deserts can all serve as physical boundaries. Many times, political boundaries between countries or states form along physical boundaries. The boundary between France and Spain follows the peaks of the Pyrenees mountains, while the Alps separate France from Italy.
Political Boundaries- are the dividing lines between countries, states, provinces, counties, and cities. These lines, more often called borders, are created by people to separate areas governed by different groups.
Economic boundaries- This divides people with different incomes or levels of wealth. Sometimes these boundaries fall on national borders. The border between the developed country of the United States and the underdeveloped country of Mexico is an economic boundary as well as a political one.