Mangrove National Park (红树林生态公园), Binhai Freeway Futian 福田区滨海大道. China's smallest national park. Hong Kong's Mai Po Marshes are one of the world's great birdwatching paradises as birds migrating from Siberia rest in the fishponds. The same birds also rest in the mangroves on Shenzhen Bay a scant two miles north of Mai Po. In the late 1990s when the Binhai Freeway was being built, there was public outrage at plans to route the freeway through the bird habitat of the mangroves. The freeway was moved 200 metres north and China's smallest national park was founded. The bird watching is legendary, but if you are not into birds, the park provides coconut palm shaded walks and views to die for across Shenzhen Bay.