Since the British colonialisation in 1841 after the First Opium War, Hong Kong has grown from a stony outcrop on the southern coast of China to a territory whose property prices are among the highest in the world. The territory has a land mass of 1,111 km2 (429 sq mi). According to government figures as at 2018, most of the land in Hong Kong is woodland, shrubland and grassland – much of which designated as country parks such as Lion Rock, Plover Cove Country Park and Sai Kung East Country Park, and only approximately 25% of the land mass out of the total territory is classed as "built-up". Most of the 7.3 million people in Hong Kong inhabit an area measuring 78 km2 (30 sq mi). Excluding rural settlement housing, which represents 7% of the city's total domestic households, the remainder of