Four Corners Monument
The Four Corners Monument marks the quadripoint in the Southwestern United States where the states of Arizona, Colorado, New Mexico, and Utah meet. It is the only point in the United States shared by four states, leading to the area being named the Four Corners region. The monument also marks the boundary between two semi-autonomous Native American governments, the Navajo Nation, which maintains the monument as a tourist attraction, and the Ute Mountain Ute Tribe Reservation.
Assyria
At its peak, the Assyrian empire ruled over what the ancient Mesopotamian religion referred to as the "Four Corners of the World": as far north as the Caucasus Mountains within the territory of present-day Armenia and the Republic of Azerbaijan, as far east as the Zagros Mountains within the territory of present-day Islamic Republic of Iran, as far south as the Arabian Desert of today's Kingdom of Saudi Arabia, as far west as the island of Cyprus in the Mediterranean Sea, and even further to the west in Egypt and eastern Libya.