On the northern tip of New Zealand's South Island, Farewell Spit stretches 30 kilometers eastward into the Tasman Sea from the Cape Farewell mainland. A sandy beach faces the open waters of the Tasman Sea, while an intricate wetland ecosystem faces south toward Golden Bay. On the southern side, the spit is protected by several kilometers of mudflats, which are alternately exposed and inundated with the tidal rhythms of the ocean. The wetlands of Farewell Spit are on the Ramsar List of Wetlands of International Significance. This image from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite shows Cape Farewell (left) and Farewell Spit. The sandy dunes on the north side of the spit give way to green vegetation along the southern perimeters. The image captured a great amount of detail of the submerged tidal flats, which appear in shades of bluish-purple. The flats are etched with many channels, giving the flats the appearance of underwater mountains and canyons. Near the shore, the blue-purple color of the flats is tinged with green (see high-resolution image), suggesting the area is home to aquatic plants that can tolerate daily flooding. More than 80 species of wetland birds have been observed at Farewell Spit. Among them are numerous species of migratory shorebirds traveling the East Asia-Australasia flyway. Some birds arrive for the summer, while others fly in for the winter. According to the New Zealand Department of Conservation, the tidal mudflats on Farewell Spit are also an important molting (feather shedding and replacement) site for 12,000 black swans. This image was acquired February 13, 2001. The area shown is located near 40.7 degrees south latitude, 172.6 degrees east longitude. The large image covers an area of 37.5 x 58.3 km.