Blue Hole (New Jersey)
The Blue Hole is located in the Pinelands of Monroe Township, Gloucester County, New Jersey and Winslow Township, Camden County, New Jersey. It is a clear blue body of water situated in the middle of a dense forest, with many similar such lakes in its immediate vicinity. The water has warm and cold spots, averaging 58 to 60 degrees Fahrenheit. The color is very unusual, as most lakes and ponds in the area are brownish due to large deposits of bog iron and the presence of tannic acid. The Blue Hole is circular and about across. In the 1930s, the Blue Hole was a popular party and swimming spot. A wooden footbridge over the Great Egg Harbor River that once made the Hole easily accessible was wiped out by a storm in the 1960s; now it can only be reached on foot.
Happy Valley, Hong Kong
On 19 December 1941, the Japanese Imperial Army entered the hill east of the valley and fought their way to Blue Pool Road. On (now Blue Pool Road) a number of large massacres occurred, most notably the Blue Pool Road Massacre, where civilians were bayoneted. Civilians and Soldiers captured were kept in the appalling conditions of 'the black hole of Hong Kong' (a house on Blue Pool Road). The Japanese later advanced up to Wong Nai Chung Gap, where the battle of Wong Nai Chung gap occurred, resulting in Japanese control of the gap. Although the low-areas of Happy Valley were captured, areas surrounding Leighton hill and Morrison Hill were still contested until later in the Battle of Hong Kong.