New Kowloon
On the other hand, the territory north of Boundary Street (later known as New Kowloon) remained part of Qing Empire until it was leased as part of the New Territories to the UK in 1898 for 99 years under the Convention for the Extension of Hong Kong Territory (also known as the Second Convention of Peking). The area of New Kowloon was defined by law in 1937 to increase land available for urban development. In practice, nevertheless, both the areas to the south and to the north of Boundary Street (i.e. both Kowloon and New Kowloon), from the Lei Yue Mun strait in the east to Mei Foo Sun Chuen and Lai Chi Kok Bay in the west, are collectively known as "Kowloon". For example, a postal address in Kwun Tong will identify "Kowloon" as its regional destination, even though it is technically in New Kowloon and not part of Kowloon as statutorily defined.