evidence: Pratas is a single, isolated island at 20-42N, 116-43E. A line drawn on the map from Pratas to Hong Kong to Swatow and back to Pratas forms a nearly equi- lateral triangle with sides about 170 nautical miles long. About 220 nautical miles to the northeast is the Chinese [...] Japan. The following year the Chinese raised their flag on Pratas and the island was placed under the administration of the government of Kwangtung Province. In 1926 the Chinese Navy established a weather station there which was provided with radio communications. [...] Since Pratas is over 200 miles from the nearest other Nationalist territory and only about 130 miles from the Communist- held mainland, it must be considered vulnerable to Communist attack.