an important river in the southwestern United States; rises in the Rocky Mountains of northern Colorado and flows southwest through Utah into Arizona (where it flows through the Grand Canyon) and then southward through the southern tip of Nevada, then forming the border between California and Arizona and finally into Mexico where it empties into the Gulf of California; the main source of water in the southwestern United States 米国南西部における重要な川。コロラド北部のロッキー山脈で源を発し、ユタを通ってアリゾナへと南西に流れ、（ここでグランドキャニオンを通りぬける）、その後南向きにネバダの南端を通り、カリフォルニアとアリゾナの境界を形成し、最終的にカリフォルニア湾へと注ぐメキシコに流れる。米国南西部における主な水源。
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