Saepenang (Kai: sae:penâng; Sóc Trǎng in Vietnamese) is a Kai seaport city located at the end of the southern arm of the Mekong River where it empties into the South China Sea. Saepenang is the main port and gateway city for the economic capital Krung Thanbu, as well as the second-largest Kai city with about 680,000 people. The city is home to much industrial development surrounding the container ports, and is the terminus for a major oil pipeline from Cambodia. Most heavy industry in the region is located in and around Saepenang. Its name means "mangrove marsh", which used to dot the coastline and shallow waters in abundance, much of which has disappeared recently due to coastal development and pollution.