The East Asia/Australasia Flyway extends from Arctic Russia and North America to the southern limits of Australia and New Zealand. It encompasses large parts of East Asia, all of Southeast Asia and includes eastern India and the Andaman and Nicobar Islands. The scale of avian movement along the flyway is awesome, with over 50 million migratory waterbirds, including 8 million waders, using the route annually. Flyway population estimates for migratory waders include 2.88 million Oriental Pratincole Glareola maldivarum and up to one million Marsh Sandpiper Tringa stagnatilis. Many waders travel all the way from their high arctic breeding grounds to spend the northern winter in the temperate latitudes of the southern hemisphere. For the Bar-tailed Godwit Limosa lapponica, this can entail an 11,000 km non-stop flight from Alaska to New Zealand. Some species, such as Rednecked Stint Calidris ruficollis and Spotted Greenshank Tringa guttifer (EN) also cross Bangladesh to spend the winter in eastern India.

http://www.birdlife.org/sites/default/files/attachments/8_East_Asia_Australasia_Factsheet.pdf