July 15, 1909 (, Jiyou May 28), the Sino-Portuguese began Macau demarcation negotiations.

1909 15, China and Portugal, the two sides began in Hong Kong and Macau demarcation negotiations. The Chinese representative high Qian, the Portuguese representative Martha degrees. The Japanese round "the two Chen pill" arms smuggling case in 1908, raises the Macao boundary problem. Qing court proclaimed principle as early as fixed Macao boundary. The Xiangshan Guangzhou China supplier China also request to delineate the boundaries of Macau, to protect the territory is not misappropriated. The two Chen pill "negotiations just ended, Qian Qing government to dispatch Foreign Ministry right mso Macau border to Guangdong survey, and Portuguese staff with the survey.
negotiations beginning of Portugal that more troops in Macao, in order to put pressure on China. Negotiations, Martha degrees claimed before the Portuguese occupation of Macao, China did not have a solid management of Macau, Macau, and its subsidiaries, should include the entire south of the Border Gate Macau Peninsula, plus Green Island, water, Aberdeen, Coloane, size Hengqin Island, opposite the mountain islands and all mountains near the island and all the sea, with a total area of ​​326 square kilometers. the high rather Qian that Macao original land is leased to the Portuguese islands near non-No Man's Land, Macau boundaries should be based on the old boundary Macau boundaries, the Qing government to recover the water earners
Coloane two Island. (History. Cn)