Lai Chi Wo holds the largest and the most primaeval Coastal Heritiera woods in Hong Kong. Coastal Heritiera represents the largest mangrove species in Hong Kong; its huge buttress roots extend crossly to enable them to tower on the soft mud at intertidal zone. The silvery white leaf bottoms reflect strong light to decrease the temperature of plants. Its nut-like fruit has a strong projecting almost winged keel along the outer edge, just looks like the eye of the Ultraman. The tissue of the fruit is filled with air spaces, it helps the fruit to float on sea water and disperse.