Tai Tong Stream lies in the middle of Tai Tong Valley, Yuen Long and has a high ecological value due to its rich biodiversity, especially diverse dragonfly and damselfly populations.

• 大棠河位于元朗大棠谷的中央,物种丰硕,是多种蜻蜓及豆娘的家园,极具生态价值。