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(in English also – though now rarely – Leyden) is a city and municipality in the province of South Holland in the Netherlands. It forms a single urban area with Oegstgeest, Leiderdorp, Voorschoten, Valkenburg, Rijnsburg and Katwijk, with 254,000 inhabitants. It is located on the Old Rhine, close to the cities of The Hague and Haarlem.