What is the name of the large inclined passage inside the Great Pyramid?

The large inclined passage inside the Great Pyramid is called the Grand Gallery.

This imposing corridor rises from the upper end of the Ascending Passage toward the King’s Chamber. It is roughly 47 metres long and has a corbelled ceiling, in which successive layers of stone project inward to create a tall, narrowing roof. Its scale is striking compared with the pyramid’s cramped corridors and shafts.

The Grand Gallery was part of the pyramid’s internal engineering as well as its ceremonial route. It leads toward the antechamber and King’s Chamber, and its side ledges and grooves may have helped support systems for moving or sealing massive granite blocking stones. The exact construction process remains debated.

The Ascending Passage is a frequent wrong answer because it is also inclined and connects with the gallery. The distinction is simple: the Ascending Passage is the lower sloping corridor, while the Grand Gallery is the much larger monumental passage above it.