TNP covers an area of 5090.21 hectares stretching 25km from the south to the north. The land area of TNP encompasses reclaimed lands, lagoons, estuary swamps, abandoned salt fields, abandoned fish farms, and a variety of fish farms for different aquacultures. As a wetland national park, TNP features rich and diverse habitats that in turn culminated in the diversity of the coastal ecology.
Qigu Lagoon is the largest lagoon in Taiwan where the land meets the sea. Commonly referred to as inland sea, the lagoon's outer perimeter is formed by the Qingshangang Sandbar, Wangzailiao Sandbar, and Dingtoue Sandbar. They create a buffer that slows down the rushing waves of the Taiwan Strait, allowing seawater to flow into the lagoon gently and forming an important economic region that the locals rely on heavily for farming oysters and fishing.
Dingtoue Sandbar is located at the southernmost tip of Qigu Lagoon, and its current landscape is a result of scouring by the sea current throughout the seasons. At the endless stretch of desert-like landscape, some mounds are as high as 3 stories tall, creating an illusion of being in an alien space and time when looking up the mounds from below. As the sand drifts in the wind, the visitors are transported to a desert-like environment, making it a coveted photography destination among hipsters and Internet celebrities.