Final answer:
The Western Front is known for its trench warfare, high death tolls, and stalemate during most of World War I.
Step-by-step explanation:
The front of the war characterized by horrific trench warfare, tremendous death tolls, and a stalemate between the Allies and Central Powers for most of the war is known as the Western Front. This front was the scene of a continuous line of trenches that stretched from the English Channel down to the Swiss Alps.
The trench warfare began with the Battle of the Marne in September 1914 and resulted in a deadlock that lasted for years, with neither side making significant territorial gains despite colossal casualties, epitomized by battles such as Verdun and the Somme.