Pieter Anthoniszoon Overtwater, also known as Anthonisz. or over 't Water, was a merchant/trader and official of the Dutch East India Company.

Hoorn is a city and municipality in the northwest of the Netherlands, in the province of North Holland. It is the largest town and the traditional capital of the region of West Friesland. Hoorn is located on the Markermeer, 20 kilometers (12 mi) east of Alkmaar and 35 kilometers (22 mi) north of Amsterdam. The municipality has just over 73,000 inhabitants and a land area of 20.38 km2 (7.87 sq mi), making it the third most densely populated municipality in North Holland after Haarlem and Amsterdam. Apart from the city of Hoorn, the municipality includes the villages of Blokker and Zwaag, as well as parts of the hamlets De Bangert, De Hulk and Munnickaij.