Marina Bay is a bay in central Singapore surrounded by the borders of four other planning areas. The area around the bay itself, also known as Marina Bay, is an extension of 360 hectares to the nearby Central Business District. At the turn of the millennium, the marina center – the first major development in the marina bay area – was developed as a key business,Convention and hospitality centre. marina bay sands were introduced to our iconic skyline with its stunning architecture over the course of the year.Convention and hospitality centre. marina bay sands were introduced to our iconic skyline with its stunning architecture over the course of the year.