Kollam is an ancient trading town – trading with Romans, Chinese, Arabs, and other Orientals – mentioned in historical citations dating back to Biblical times and the reign of Solomon, connecting with Red Sea ports of the Arabian Sea (supported by a find of ancient Roman coins). There was also internal trade through the Aryankavu Pass in Schenkottah Gap connecting the ancient town to Tamil Nadu. The overland trade in pepper by bullock cart and the trade over the waterways connecting Allepey and Cochin established trade linkages that enabled it to grow into one of the earliest Indian industrial townships. The rail links later established to Tamil Nadu supported still stronger trade links. The factories processing marine exports and the processing and packaging of cashewnuts extended its trade across the globe. Kollam is the 5th largest city in Kerala and 5th in terms of corporation area. It is known for cashew processing and coir manufacturing. Ashtamudi Lake is considered the southern gateway to the backwaters of Kerala and is a prominent tourist destination at Kollam. The Kollam urban area includes suburban towns such as Paravur in the south, Kundara in the east and Karunagapally in the north of the city. Other important towns in the city suburbs are Eravipuram, Kottiyam, Kannanallur, and Chavara.