The port on the western coast that was attacked and plundered by Shivaji in 1664 was Surat.

Background:
- Shivaji Bhonsle, also known as Chhatrapati Shivaji Maharaj, was the founder of the Maratha Empire in western India during the 17th century.
- Shivaji was known for his military and administrative skills, as well as his efforts to establish a Hindu kingdom in the region.

Attack on Surat:
- In 1664, Shivaji launched a successful attack on the port city of Surat, located on the western coast of India in present-day Gujarat.
- Surat was a prosperous trading center and one of the most important ports of the Mughal Empire.
- Shivaji's primary objective in attacking Surat was to plunder its wealth and disrupt Mughal trade and administration in the region.

Reasons for the Attack:
- Shivaji had been engaging in a series of military campaigns to expand his territory and establish his authority over the region.
- Surat, with its wealth and strategic location, presented an attractive target for Shivaji's ambitions.
- Additionally, Surat was an important center of Mughal power and control in the region, and attacking it would weaken the Mughal Empire's hold over western India.

Execution of the Attack:
- Shivaji planned the attack meticulously, taking advantage of the element of surprise and utilizing his naval and military forces.
- He assembled a large fleet of ships and a well-trained army to carry out the assault on Surat.
- The attack was launched in the early hours of the morning, catching the defenders off guard.
- Shivaji's forces quickly overpowered the city's defenses and began looting and plundering its wealth.
- The attack lasted for several days, during which Shivaji's forces wreaked havoc in the city and inflicted significant damage.

Consequences of the Attack:
- The plundering of Surat by Shivaji severely impacted the Mughal Empire's control over the region and disrupted trade and administration.
- The attack on Surat also brought Shivaji significant wealth and resources, which further bolstered his position and allowed him to continue his military campaigns.
- The success of the attack further enhanced Shivaji's reputation as a formidable leader and warrior, both among his supporters and his enemies.

Overall, the attack on Surat by Shivaji in 1664 was a significant event in his military career and had far-reaching consequences for the region's political and economic landscape.