Western Front: The Western Front was the primary theater of operations in World War I. It stretched from the North Sea in Belgium to the Swiss border, primarily along the border between France and Germany. The fighting in this region was characterized by trench warfare and resulted in heavy casualties.
Eastern Front: The Eastern Front was another major theater of the war, primarily involving Russia and the Central Powers (Germany, Austria-Hungary, and the Ottoman Empire). It covered a vast area from the Baltic Sea in the north to the Black Sea in the south, encompassing Poland, Ukraine, and parts of Romania and the Balkans.
Balkan Front: The Balkan Front involved fighting between the Ottoman Empire and the Allied Powers (primarily Serbia, Montenegro, Greece, and later Romania). The battles occurred in the Balkans region of southeastern Europe, with key campaigns taking place in Serbia, Bulgaria, and Greece.
Italian Front: The Italian Front consisted of conflicts between Italy and Austria-Hungary, fought mainly in the mountainous regions of northern Italy and along the border with Austria-Hungary.
Middle Eastern Front: The Middle Eastern Front saw battles between the Ottoman Empire and the Allied Powers in regions such as the Middle East, North Africa, and the Caucasus. Notable campaigns were the Gallipoli Campaign, the Sinai and Palestine Campaign, and the Mesopotamian Campaign.
African Fronts: There were several African fronts in the war, primarily involving campaigns by European colonial powers against German colonies. The main areas of fighting were German East Africa (present-day Tanzania), German Southwest Africa (present-day Namibia), and German West Africa (present-day Cameroon, Togo, and parts of Ghana and Benin).
Asian Fronts: The Asian fronts included clashes between the Ottoman Empire and the Allied Powers in regions such as the Caucasus and the Middle East. Notable battles were fought in Armenia and Mesopotamia (present-day Iraq).
In summary, World War I was a global conflict that took place primarily in Europe but also extended to various other regions, including North Africa, the Middle East, and parts of Africa and Asia.