King Michael I Park, formerly Herăstrău Park, is a large park on the northern side of Bucharest, Romania, around Lake Herăstrău, one of the lakes formed by the Colentina River. The park has an area of about 187 ha, of which 74 ha is the lake. Initially, the area was full of marshes, but these were drained between 1930 and 1935, and the park was open…King Michael I Park, formerly Herăstrău Park, is a large park on the northern side of Bucharest, Romania, around Lake Herăstrău, one of the lakes formed by the Colentina River. The park has an area of about 187 ha, of which 74 ha is the lake. Initially, the area was full of marshes, but these were drained between 1930 and 1935, and the park was opened in 1936. The park is divided into two zones: a rustic or natural zone, which is left more or less undisturbed, and a public/'active' domain with open areas for recreation activities. Small boats are allowed on the lake.