Vapi is a city and a municipality in Valsad district in the Indian state of Gujarat. It is situated on the banks of Damanganga River in southern Gujarat. Vapi is declared as a Taluka of Valsad District.

Around 28 km south of the district headquarter city of Valsad, it is surrounded by Union Territories of Daman on the west and by Dadra and Nagar Haveli on the east. Economic and industrial growth of the recent decades has however blurred the physical boundaries and the 21 km of Daman-Vapi-Silvassa belt has almost become a monolith.

National Highway No. 48 bisects the town, creating east and west parts - the western part being the original old town-place and the eastern part mainly hosting the industries and residential area & via the modernized highway, Mumbai is about 180 km to the south and the city of Surat is about 125 km to the north.

To cater to the industry, the town handles a huge amount of what is called a "floating population" and the Vapi railway station on the Mumbai-Vadodara rail link of Western Railway (India) has become the direct beneficiary in terms of revenues due to daily commuters.

The Arabian Sea is about 7 km to the west, where the Daman Ganga River creates its delta. The city has tropical weather and enjoys three distinct seasons of mild winter, moderate summer and heavy monsoon, with an average rainfall ranging from 100 inches to 120 inches per annum.

In addition to the old town, some of the other main residential areas and suburbs are Gunjan, Chanod Colony, Vapi Town, Haria Park, Chala and also upcoming Balitha and Salvav with many other small areas

As per provisional reports of Census India, population of Vapi in 2011 is 163,630 of which male and female are 94,338 and 69,267 respectively. Although Vapi city has population of 163,605, the sex ratio of Vapi city is 734 per 1000 males. Child sex ratio of girls is 874 per 1000 boys. Total children (0-6) in Vapi city are 19,899 as per figure from Census India report on 2011. There were 10,618 boys while 9,281 are girls. The child forms 12.16 % of total population of Vapi City. Being on the Gujarat-Maharashtra border, Gujarati, Hindi and Marathi are the main languages spoken in Vapi. Many of the workers working in small scale chemical factories are migrant workers from State of Utter - Pradesh, Bihar, Jharkhand, Maharashtra & Orissa etc.