The two crossword solutions for the term 'Neighbor of Hong Kong' are Macau and Macao. Both Macau and Macao are special administrative regions of China located on the western side of the Pearl River Delta, bordering Guangdong Province to the north and the South China Sea to the east and south. Macau is a former Portuguese colony and is now the world's most densely populated region. Macao is a former Portuguese trading post and is now a major gambling destination. Both Macau and Macao are popular tourist destinations due to their unique culture, cuisine, and architecture.