Manila Bay is an important historical, cultural and economics resource of the Philippines. Around 30 percent of the country's population resides in the Manila Bay watershed area, and contribute as much as 52.5 percent of the national GDP. An economic valuation study (2005) of the uses of Manila Bay' resources (i.e, mangroves,mudflats and coral reefs), revealed a total value of more than 8 billion pesos per year. This amount represents a partial assessment of the total economic value of Manila Bay. The acctual total economics value is, to all account, larger. Such information provide assurance that the Bay is a valuable resource that must be protected and managed sustainably. It is also a warning of what could be lost is concerted action are not taken an initial valuation of damages to the ecosystem of Manila Bay, and the resulting social.