The above image of the Po Toi Island Group (蒲台羣島) is a detail taken from the map titled: The Territory of Hong Kong, Scale 1:100,000, Series HM 100 CL, Edition 6, 1985 as prepared by Survey Division, Lands Department, Hong Kong Government.
According to: A Gazetteer of Place Names in Hong Kong, Kowloon and the New Territories, Government Press, Hong Kong 1960:
The Po Toi Island Group (蒲台羣島) is made up of a small group of islands situated due south of the Stanley and D’Aguilar Peninsulas. They have a total area of 2,084 square miles. They are all barren and virtually treeless, rising steeply out of the sea and providing little or no suitable points for landing or shelter for shipping. The island of Po Toi is the only one inhabited, though Waglan Island is used as a base for a lighthouse covering the eastern approaches to the harbour.
Po Toi Island (蒲台島) – this island, in area 1,373 square miles, is inhabited by about 180 villagers who make a precarious living by farming and a little fishing. The village elder, until her death in 1957, was a woman who was then responsible for settling all village disputes. It is most uncommon for a woman to be a village elder.
Beaufort Island or Lo Chau (螺洲) – an uninhabited island, in area 0.475 square mile.
Castle Rock or Lo Chau Pak Pai (螺洲白排) – a small rock about half mile SW of Beaufort Island.
Sung Kong (宋崗) – an uninhabited island, in area 0.195 square mile, NE of Po Toi Island.
Waglan Island or Wang Lan Do (橫瀾島) – a small group of islands, in area 0.041 square mile, at the SE extremity of the Colony’s waters. They are uninhabited except for a lighthouse on one of the islands.