Da Nang, Oct. 31 -- The central city of Da Nang's diverse ecosystems, ranging from forests in the Truong Son Range and nature reserves to wetlands and a UNESCO biosphere reserve, provide a vital foundation for sustainable development as the central city seeks to become an internationally recognised ecological coastal city. Diverse ecosystems Located in the city's southern area, the Bai Say-Song Dam wetland, covering about 200 hectares, serves as a "green lung" and a habitat for numerous bird species, including the rare Asian openbill listed in Vietnam's Red Data Book. Local fisherman Nguyen Phuc said dozens of bird species appeared seasonally. Residents complied with conservation rules, refraining from hunting or trapping birds and using ...