Coastal South West India spans across the entire Arabian Sea coastline of the Indian subcontinent from the coastline of the Gulf of Kutch in its westernmost corner and stretches across the Gulf of Khambhat, and through the Salsette Island and Mumbai along the Konkan and southwards across the Raigad region and through Kanara and further down through Mangalapuram (Mangalore) and along the Malabar unto the southernmost tip to Kanyakumari (Cape Comorin). In ancient tradition Coastal South West Indian Subcontinent extends till Ceylon.
The people along coastal south west India exhibit vast diversity along an underlying commonality as a result of long history of contact with west Asian Mediterranean traders along the Arabian sea coastline.
The region includes Gujaratis in the westernmost region, Maharashtrians and Goans along the western coastline, Kannadigas in its south western coastline and Tuluvas and Malayalis in its southernmost region of South India.
As a result of the thriving trade between the Mediterranean world and South West Indian coastline along the Arabian sea, there has been significant intermingling between the people of Coastal South West India and the west asian world. Several west Asian communities have also settled and become part of the diversity of coastal south west India. These include the Parsis,Bohras  and Baghdadi Jews  in the westernmost region, the Bene Israel along the South western region the descendants of mediterranean traders along Coorg and Mangalore, the Jonakan Mappilas  along Malabar region, and the cochin jews  and Syriac Nasranis  along the southernmost region of South India.
The linguistic diversity of the Coastal south west India includes Languages of the Dravidian language family including Malayalam, Tulu, and Kannada; languages belonging to the western zone of Indo Iranian language families including Gujarati, Marathi, Konkani and languages belonging to the central zone of the Indo-Iranian language families including Urdu and Persian. The region also has speakers of Semitic languages like Arabic, Hebrew and Aramaic. The common elements of the people of coastal south west India includes cuisine that consists of agrarian and coastal products and clothing that involves long flowing drapes with bare midriff for both men and women suited for humid and warm climate. Throughout the region women wear drapes called saree in various styles. In the western corner of the region the drapes are called as Dhoti for men. and Chaniya choli for women, further southwards the drapes are called as lungi or mundu for men. and veshti for women. Another common cultural element of coastal south west India includes relatively more role for women in social system. Towards the southernmost tip of coastal south western India the social system is considerably more matri-focal with instances of matrilineal and matriarchal tradition like amongst the Bunt community of Tulus and the Marumakkathayam of the nairs. This is also manifested in feminine deity oriented festivals and rituals celebrating Shakti or feminine power  like Navratri festival among the Gujarati People and Thiruvathira festival among the Malayali people.