Arres

Arres is a municipality in the comarca of the Aran Valley in Catalonia, Spain, close to the French border. The mayor is Pere Castet i Farré (CDA).

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Arresø

Arresø is a lake on the island of Zealand in Denmark.

Located in the region of Hovedstaden just north of Ølsted and east of Frederiksværk, Arresø is Denmark's largest lake, based on area, at 40,72 km² (15.39 sq mi). The lake runs into Roskilde Fjord through the Arresø Canal in Frederiksværk. The canal was begun around 1717 by royal command, and the work was carried out by Danish soldiers and Swedish POW's.

There are a number of rivers and streams running into the Arresø of which the Pøleå is the most significant. The landscape is especially hilly along the lake's west side. Among these ridges are Maglehøj in the town of Frederiksværk and Arrenakke Hills, which offers a magnificent view of the lake. East of Frederiksværk, the Arrenæs peninsula juts out into the lake.

Historically, Arresø was a fjord, connected to the Kattegat, but the land northwest of here rose after the last Ice Age, locking the waters in and creating the lake.

Arresø has a rich bird and floral life. Sea eagles have returned as nesting birds, and beavers have been reintroduced. Several wildlife preserves have been set up around the lake and it will also form part of national park Royal North Sealand currently being planned and established in North Zealand.