Negombo is a major city in Sri Lanka, situated on the west coast and at the mouth of the Negombo Lagoon, in the Western Province, 38 km fro…Negombo is a major city in Sri Lanka, situated on the west coast and at the mouth of the Negombo Lagoon, in the Western Province, 38 km from Colombo via the Colombo–Katunayake Expressway and the nearest major city from the Bandaranaike International Airport.