The major gap in the Western Ghats is at:

The Palghat Gap (also known as the Palakkad Gap) is a major break or low mountain pass in the Western Ghats mountain range in southwestern India. It is located between the Nilgiri Hills to the north and the Anaimalai Hills to the south, connecting the state of Kerala with Tamil Nadu. It spans an average width of about $30\text{km}$ and serves as a vital transport corridor.